Ems Recall
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Questions and Answers
- 1.
A group of wavelengths (or) frequencies is known as:
- A.
Group of colours
- B.
Spectrum
- C.
Colour band
- D.
None
Correct Answer
B. SpectrumExplanation
A group of wavelengths or frequencies is known as a spectrum. This term is commonly used in physics and refers to the range of colors or electromagnetic waves that are produced when light is dispersed. It can also be used in other contexts, such as the spectrum of sound frequencies or the spectrum of radio waves. The term "group of colors" and "color band" are not as commonly used or specific in describing the concept of a range of wavelengths or frequencies.Rate this question:
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- 2.
Electromagnetic radiations waves are:
- A.
Mechanical
- B.
Longitudinal
- C.
Transverse
- D.
Stationary
Correct Answer
C. TransverseExplanation
Electromagnetic radiation waves are transverse. This means that the oscillations of the waves are perpendicular to the direction of wave propagation. Unlike mechanical waves, such as sound waves, electromagnetic waves do not require a medium to travel through. They can travel through a vacuum, as well as through different mediums like air or water. Examples of electromagnetic waves include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.Rate this question:
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- 3.
The longest wavelength of the spectrum.
- A.
Radio Waves
- B.
UV Waves
- C.
Visible Light
Correct Answer
A. Radio WavesExplanation
Radio waves have the longest wavelength in the electromagnetic spectrum. They have wavelengths ranging from about 1 millimeter to 100 kilometers. These waves are used for various purposes, including communication, broadcasting, and radar systems. They have lower frequencies and carry less energy compared to other types of waves, such as visible light or UV waves. Due to their long wavelength, radio waves can travel long distances and penetrate obstacles easily, making them suitable for long-range communication.Rate this question:
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- 4.
The shortest wavelength of the spectrum.
- A.
Microwaves
- B.
Infrared Waves
- C.
Gamma Rays
Correct Answer
C. Gamma RaysExplanation
Gamma rays have the shortest wavelength in the electromagnetic spectrum. They have wavelengths shorter than X-rays and are produced by the most energetic events in the universe, such as supernovae and black holes. Gamma rays have high energy and can penetrate through most materials, making them useful in medical imaging and cancer treatment. Due to their high energy, gamma rays are also highly ionizing and can cause damage to living cells, which is why they need to be carefully shielded and monitored.Rate this question:
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- 5.
This type of electromagnetic radiation is the most dangerous to humans:
- A.
X-rays
- B.
Gamma rays
- C.
Microwaves
- D.
Infrared waves
Correct Answer
B. Gamma raysExplanation
Gamma rays are the most dangerous type of electromagnetic radiation to humans. They have the highest energy and can penetrate deep into the body, causing damage to cells and DNA. Exposure to gamma rays can lead to various health effects, including radiation sickness, cancer, and even death. X-rays, microwaves, and infrared waves have lower energy and are less harmful to humans compared to gamma rays.Rate this question:
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- 6.
Electromagnetic waves are transverse waves that transfer
- A.
Sound energy
- B.
Photons
- C.
Electrical energy
- D.
Magnets
Correct Answer
B. PhotonsExplanation
Electromagnetic waves transfer energy in the form of photons. Photons are discrete packets of energy that make up electromagnetic radiation. These waves can travel through a vacuum or a medium and do not require a medium to propagate. They are produced by the acceleration of charged particles and can have various wavelengths and frequencies, giving rise to different types of electromagnetic waves such as radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.Rate this question:
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- 7.
Which of the following is not an example of electromagnetic radiation?
- A.
Dangerous Gamma Rays
- B.
Photons of energy traveling through space
- C.
The sonic boom of a jet
- D.
Wi-fi signals
Correct Answer
C. The sonic boom of a jetExplanation
The sonic boom of a jet is not an example of electromagnetic radiation because it is a result of the shock waves produced by an object traveling faster than the speed of sound. Electromagnetic radiation consists of photons of energy that travel through space, such as gamma rays and wi-fi signals. The sonic boom, on the other hand, is a physical phenomenon caused by the compression of air molecules and does not involve the transmission of electromagnetic waves.Rate this question:
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- 8.
The distance between A and F is the _____________.
- A.
Frequency
- B.
Period
- C.
Amplitude
- D.
Wavelength
Correct Answer
D. WavelengthExplanation
The distance between A and F is referred to as the wavelength. In wave terminology, wavelength represents the distance between two corresponding points on a wave, such as two crests or two troughs. It is measured in meters and is an important parameter in understanding the characteristics and behavior of waves.Rate this question:
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- 9.
The amount of energy carried by an electromagnetic wave increases with frequency. Which of the following groups of waves is listed in order of increasing energy?
- A.
X-rays, visible light, radio waves
- B.
Infrared waves, visible light, radio waves
- C.
Radio waves, visible light, x-rays
Correct Answer
C. Radio waves, visible light, x-raysExplanation
The correct answer is radio waves, visible light, x-rays. This is because the energy carried by an electromagnetic wave is directly proportional to its frequency. Radio waves have the lowest frequency and therefore the lowest energy. Visible light has a higher frequency and energy than radio waves. X-rays have the highest frequency and energy among the given options.Rate this question:
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- 10.
Which of the following emits infrared radiation(s)?
- A.
Hot iron
- B.
Ice
- C.
Freezing mixture
- D.
Fire
- E.
Sunlight
Correct Answer(s)
A. Hot iron
D. Fire
E. SunlightExplanation
Hot iron, fire, and sunlight all emit infrared radiation. Infrared radiation is a type of electromagnetic radiation that has longer wavelengths than visible light. When an object is hot, it emits radiation in the form of heat, and this radiation includes infrared waves. Fire is a process that involves the release of heat and light, and both heat and light contain infrared radiation. Sunlight also contains infrared radiation along with other types of radiation such as visible light and ultraviolet radiation.Rate this question:
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- 11.
ROY G BIV is what part of the EMS?
- A.
Gamma rays
- B.
Radio Waves
- C.
Visible Light
Correct Answer
C. Visible LightExplanation
ROY G BIV is an acronym used to remember the colors of the visible light spectrum: Red, Orange, Yellow, Green, Blue, Indigo, and Violet. Therefore, the correct answer is Visible Light.Rate this question:
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- 12.
Produced by dying stars, decaying nuclei, and used in killing cancer cells.
- A.
Visible Light
- B.
Infrared Waves
- C.
Gamma Rays
Correct Answer
C. Gamma RaysExplanation
Gamma rays are produced by dying stars, decaying nuclei, and are also used in killing cancer cells. This makes them the correct answer because the other options, visible light and infrared waves, do not have these properties. Visible light is a form of electromagnetic radiation that is visible to the human eye, while infrared waves have longer wavelengths than visible light and are commonly used in heat detection. Therefore, gamma rays are the only option that fits the given description.Rate this question:
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- 13.
How much of the electromagnetic spectrum is visible to just the human eye?
- A.
All of it (radio, microwaves, infrared, visible light, UV, X-rays, gamma rays)
- B.
None of it (no rays)
- C.
Most of it (only radio, infrared, x-rays, gamma rays)
- D.
Only a small part (visible light)
Correct Answer
D. Only a small part (visible light)Explanation
The human eye is only capable of perceiving a small portion of the entire electromagnetic spectrum, known as visible light. This portion includes the colors that we can see, ranging from red to violet. Other types of electromagnetic waves, such as radio waves, microwaves, infrared, ultraviolet, X-rays, and gamma rays, are not visible to the human eye. Therefore, the correct answer is "only a small part (visible light)."Rate this question:
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- 14.
This color has the longest wavelength of visible light:
- A.
Red
- B.
Orange
- C.
Yellow
- D.
Green
- E.
Blue
- F.
Indigo
- G.
Violet
Correct Answer
A. RedExplanation
Red has the longest wavelength of visible light compared to the other colors listed. Wavelength is the distance between two corresponding points on a wave, and longer wavelengths correspond to lower frequencies. In the visible light spectrum, red light has the longest wavelength and the lowest frequency, while violet light has the shortest wavelength and the highest frequency.Rate this question:
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- 15.
What is the Electromagnetic Spectrum?
- A.
The range of EM waves according to their frequencies
- B.
The vibration of electrically charged particles that surround the electric field
- C.
Range of chemical formulas based on nomenclature
Correct Answer
A. The range of EM waves according to their frequenciesExplanation
The correct answer is "The range of EM waves according to their frequencies." The electromagnetic spectrum refers to the entire range of electromagnetic waves, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. These waves are categorized based on their frequencies, with radio waves having the lowest frequency and gamma rays having the highest frequency. This classification allows scientists to study and understand different types of electromagnetic radiation and their properties.Rate this question:
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- 16.
Visible light is light that humans can see. What is the range of colors in order from short to long wavelength?
- A.
Violet, indigo, green, red, orange
- B.
Red, Orange, Yellow, Green, Blue, Indigo, and Violet
- C.
Violet, indigo, blue, green, yellow, orange, red
Correct Answer
C. Violet, indigo, blue, green, yellow, orange, redExplanation
The range of colors in order from short to long wavelength is violet, indigo, blue, green, yellow, orange, red.Rate this question:
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- 17.
Light travels in...
- A.
A limo
- B.
Curved lines. If it didn't, we wouldn't be able to see.
- C.
Straight lines
- D.
By bus. It's the easiest, cheapest and most economical way.
- E.
The day time
Correct Answer
C. Straight linesExplanation
Light travels in straight lines. This is because light is a form of electromagnetic radiation, and it propagates in a straight line until it encounters an obstacle or medium that causes it to change direction. This property of light allows us to see objects and perceive the world around us, as light rays reflect off objects and enter our eyes in straight lines.Rate this question:
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- 18.
The distance between D and I is the _____________.
- A.
Frequency
- B.
Trough
- C.
Amplitude
- D.
Wavelength
Correct Answer
D. WavelengthExplanation
The distance between two points in a wave is measured by its wavelength. In this case, the distance between points D and I is being referred to, so the correct answer is wavelength.Rate this question:
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- 19.
A and F are what part of the wave?
- A.
Crests
- B.
Troughs
- C.
Amplitudes
- D.
Wavelength
Correct Answer
A. CrestsExplanation
A and F are the points on a wave that represent the highest points or peaks of the wave. These points are called crests.Rate this question:
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- 20.
D and I are what part of the wave?
- A.
Crests
- B.
Troughs
- C.
Amplitudes
- D.
Wavelength
Correct Answer
B. TroughsExplanation
D and I are the parts of the wave that represent troughs. A trough is the lowest point or the bottom of a wave. It is the opposite of a crest, which is the highest point or the top of a wave. In a wave, there are alternating crests and troughs. Therefore, D and I represent the troughs in the wave.Rate this question:
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- 21.
Which electromagnetic waves are used to kill bacteria?
- A.
Gamma
- B.
X-rays
- C.
UV
- D.
Infrared
Correct Answer(s)
A. Gamma
C. UVExplanation
Gamma rays and UV (ultraviolet) rays are both forms of electromagnetic waves that have the ability to kill bacteria. Gamma rays have high energy and can penetrate through materials, making them effective in sterilization processes. UV rays, specifically UV-C, have germicidal properties and are commonly used in disinfection applications, such as in water treatment and air purification systems.Rate this question:
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- 22.
Which waves on the electromagnetic spectrum are considered not dangerous?
- A.
Radio waves
- B.
Gamma waves
- C.
Infrared waves
- D.
Ultraviolet waves
- E.
Visible light
Correct Answer(s)
A. Radio waves
C. Infrared waves
E. Visible lightExplanation
Radio waves, infrared waves, and visible light are considered not dangerous because they have lower frequencies and energy levels compared to gamma waves and ultraviolet waves. Gamma waves have the highest frequency and energy, making them the most dangerous, while ultraviolet waves have higher energy than visible light and can cause harm to the skin and eyes. However, radio waves, infrared waves, and visible light are commonly used in various technologies and are generally safe for human exposure.Rate this question:
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- 23.
In the Electromagnetic Spectrum, the waves with higher frequencies have __________ energy.
- A.
Higher
- B.
Lower
- C.
No change in in energy they all travel at the speed of light in a vacuum (can't trick me)
Correct Answer
A. HigherExplanation
In the electromagnetic spectrum, waves with higher frequencies have higher energy. This is because energy is directly proportional to frequency. As the frequency of a wave increases, the energy carried by each wave packet also increases. Therefore, waves with higher frequencies have more energy compared to waves with lower frequencies.Rate this question:
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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
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Mar 22, 2023Quiz Edited by
ProProfs Editorial Team -
Nov 05, 2019Quiz Created by
Kyle Pearson
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