# Chapter 17.2 Electromagnetic Waves Have Many Uses.

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Electromagnetic waves are what transfer electromagnetic radiation through space, which is involved in a number of applications such as microwaves, radio waves, gamma rays, infrared, x-rays light and ultraviolet. As you can see, it has many uses. What are the details of these uses? You tell us!

• 1.

### EM waves have different ______

Explanation
EM waves have different frequencies because they are composed of oscillating electric and magnetic fields that vary in time. The frequency of an EM wave refers to the number of complete oscillations it makes in one second. Different frequencies correspond to different types of EM waves, such as radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. These waves have varying frequencies that determine their properties, behaviors, and interactions with matter.

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• 2.

### The _______ of an EM wave also determines its characteristics and uses.

Explanation
The frequency of an electromagnetic wave refers to the number of complete cycles it completes in one second. It is a fundamental property of waves and determines their characteristics and uses. Different frequencies of electromagnetic waves have different properties and applications. For example, radio waves have lower frequencies and are used for communication, while X-rays have higher frequencies and are used for medical imaging. Therefore, the frequency of an EM wave plays a crucial role in determining its behavior and practical applications.

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• 3.

### ______ frequency EM waves, with more electromagnetic vibrations per second, have more energy.

Explanation
The frequency of an electromagnetic wave refers to the number of vibrations or cycles it completes in one second. Higher frequency waves have more vibrations per second, indicating a greater amount of energy. This is because the energy of an electromagnetic wave is directly proportional to its frequency. Therefore, waves with higher frequencies possess more energy.

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• 4.

### Higher-frequency EM waves, with more electromagnetic wibrations per second, have more _______.

Explanation
Higher-frequency electromagnetic waves have more energy because the frequency of a wave is directly proportional to its energy. As the frequency increases, the energy of the wave also increases. This is because the energy of a wave is carried by its individual vibrating particles, and higher frequencies mean more vibrations per second, resulting in a greater amount of energy being transmitted. Therefore, higher-frequency EM waves have more energy.

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• 5.

### Lower-frequency EM waves, with ______ wavelengths, have less energy.

Explanation
Lower-frequency electromagnetic waves have longer wavelengths. This means that the distance between consecutive peaks or troughs of the wave is greater. As a result, these waves have less energy. This is because the energy of an electromagnetic wave is inversely proportional to its wavelength. So, as the wavelength increases, the energy decreases.

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• 6.

### The range of all EM frequencies is known as the electromagnetic ________.

Explanation
The range of all EM frequencies is known as the electromagnetic spectrum. This spectrum encompasses all the different types of electromagnetic waves, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. It represents the entire range of frequencies and wavelengths that electromagnetic waves can have, from the longest radio waves to the shortest gamma rays. The electromagnetic spectrum is a fundamental concept in physics and is used to study and understand various phenomena, such as the behavior of light and the interaction between electromagnetic waves and matter.

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• 7.

### Radio waves have _____ wavelengths than gamma rays.

Explanation
Radio waves have longer wavelengths than gamma rays. Wavelength is the distance between two consecutive points on a wave. Radio waves have longer wavelengths, which means that they have a greater distance between consecutive points compared to gamma rays. This difference in wavelength results in radio waves having lower frequencies and less energy than gamma rays.

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• 8.

### Microwaves are part of the ____ wave range.

Explanation
Microwaves are part of the radio wave range because they have wavelengths between approximately 1 millimeter and 1 meter, which falls within the radio wave spectrum. Radio waves are a type of electromagnetic radiation that have longer wavelengths and lower frequencies than visible light. Microwaves are commonly used for communication, cooking, and heating because they can penetrate certain materials and are absorbed by water and other molecules, causing them to vibrate and generate heat.

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• 9.

### _____ waves are located at 10000000000000 (10^13) hertz.

Explanation
Infrared waves are located at 10000000000000 (10^13) hertz. Infrared light refers to the portion of the electromagnetic spectrum with wavelengths longer than those of visible light and shorter than those of microwaves. It is commonly used in various applications such as remote controls, thermal imaging, and communication. The given answer options correctly identify the different ways to refer to these waves, using both capitalized and lowercase letters.

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• 10.

### All EM waves move at the _____ speed in a vacuum.

Explanation
All electromagnetic waves, including visible light, radio waves, and X-rays, travel at the same speed in a vacuum. This speed is approximately 299,792,458 meters per second, which is commonly rounded to 3.00 x 10^8 meters per second. This fundamental property of electromagnetic waves is known as the speed of light. It is a universal constant and does not depend on the wavelength or frequency of the wave. Therefore, regardless of the type or energy of the electromagnetic wave, they all propagate through a vacuum at the same speed.

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• 11.

### _____ rays have a frequency of 100000000000000000000000 (10^23) hertz.

Explanation
Gamma rays have a frequency of 10^23 hertz. Gamma rays are a form of electromagnetic radiation that have the highest frequency and energy in the electromagnetic spectrum. They are produced through nuclear reactions and radioactive decay. Gamma rays are used in various applications such as medical imaging, cancer treatment, and sterilization. The lowercase "gamma" is the correct answer because it refers to the specific type of radiation, while the uppercase "Gamma" is incorrect.

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• 12.

Explanation
A radio transmitter is a device that converts sound waves into radio waves. It takes the electrical signals produced by a microphone or other sound source and amplifies them before sending them out as radio waves. These radio waves can then be received by a radio receiver and converted back into sound waves, allowing the transmission of sound over long distances. Therefore, a radio transmitter is the correct answer as it accurately describes the device that performs this conversion process.

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• 13.

### An AM signal is encoded int the signal by varying the ________.

Explanation
In an AM (Amplitude Modulation) signal, the information is encoded by varying the amplitude of the carrier wave. This means that the strength or height of the carrier wave is altered in order to represent the audio or data being transmitted. By changing the amplitude, the signal can carry different levels of energy, which can then be decoded by the receiver to retrieve the original information. Therefore, the correct answer is amplitude.

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• 14.

### FM singals are encoded by varying the radio waves ______.

Explanation
FM signals are encoded by varying the radio waves frequency. This means that the frequency of the radio waves carrying the FM signals is changed or modulated in order to encode the information. By varying the frequency, the FM signals can carry different audio or data signals, allowing for a wide range of content to be transmitted over the airwaves.

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• 15.

### _____ stands for radio detection and ranging.

Explanation
RADAR stands for radio detection and ranging. It is a system that uses radio waves to detect and locate objects such as aircraft, ships, and weather formations. The term "RADAR" is an acronym, with each letter representing a word in the phrase. The acronym is typically written in all capital letters, but it can also be written with only the first letter capitalized (Radar) or in all lowercase letters (radar). Regardless of the case used, the term refers to the same technology and concept.

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• 16.

### Cell phones use a radio transmitter and receiver that uses ________.

Explanation
Cell phones use microwaves as the radio transmitter and receiver. Microwaves are a type of electromagnetic radiation that have a shorter wavelength than radio waves. They are able to carry signals over long distances and are commonly used in telecommunications. The use of microwaves allows cell phones to transmit and receive voice and data signals wirelessly, making them an essential component of mobile communication.

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• 17.

### ____________, visible, and ultraviolet light have mid-range wavelengths and frequencies.

Explanation
Infrared and infrared light have mid-range wavelengths and frequencies, making them fall between visible and ultraviolet light.

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• 18.

### X-rays and gamma rays have _____ wavelengths and high frequencies.

Explanation
X-rays and gamma rays have short wavelengths and high frequencies. This is because both x-rays and gamma rays are forms of electromagnetic radiation that have shorter wavelengths compared to visible light. Shorter wavelengths correspond to higher frequencies according to the electromagnetic spectrum. X-rays and gamma rays are typically used in medical imaging and radiation therapy due to their ability to penetrate through tissues and ionize atoms, making them useful for diagnostic and therapeutic purposes.

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• 19.

### X-rays and gamma rays have short wavelengths and ____ frequencies.

Explanation
X-rays and gamma rays have short wavelengths, which means that they have a high frequency. This is because wavelength and frequency are inversely related - as the wavelength decreases, the frequency increases. Therefore, the correct answer is high.

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• 20.

### Select the electromagnetic wave with the longest wavelengths

• A.

Gamma rays

• B.

Visible light

• C.

Ultraviolet light

• D.

Microwaves

D. Microwaves
Explanation
Microwaves have the longest wavelengths among the given options. Electromagnetic waves are categorized based on their wavelengths, and microwaves fall in the longer wavelength region of the spectrum. Gamma rays have the shortest wavelengths and are highly energetic, while visible light and ultraviolet light have shorter wavelengths compared to microwaves. Therefore, microwaves have longer wavelengths than the other options, making them the correct answer.

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• 21.

### Which of these have the shortest wavelengths.

• A.

X-ray

• B.

Infrared

• C.

Visible

• D.

A. X-ray
Explanation
X-rays have the shortest wavelengths among the given options. X-rays are a form of electromagnetic radiation with high energy and short wavelengths, ranging from about 0.01 to 10 nanometers. This allows them to penetrate through materials and create detailed images of the internal structures of objects. In contrast, infrared, visible, and radio waves have longer wavelengths and lower energy. Infrared waves have wavelengths ranging from about 700 nanometers to 1 millimeter, visible light waves have wavelengths between 400 and 700 nanometers, and radio waves have wavelengths ranging from about 1 millimeter to 100 kilometers.

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• 22.

### Which of these has the highest energy.

• A.

• B.

Visible

• C.

Infrared

• D.

Gamma

D. Gamma
Explanation
Gamma rays have the highest energy among the given options. Gamma rays are a form of electromagnetic radiation with the shortest wavelength and highest frequency. They are produced by nuclear reactions and radioactive decay. Due to their high energy, gamma rays can penetrate through most materials and are commonly used in medical imaging, cancer treatment, and industrial applications.

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• Mar 21, 2023
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• Feb 11, 2009
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