# Ps Unit 7 Quiz

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A quiz on waves.

• 1.

### A wave will travel only as long as it has ____ to carry.

• A.

Energy

• B.

Mass

• C.

Amplitude

• D.

Matter

A. Energy
Explanation
A wave will travel only as long as it has energy to carry. Energy is the driving force behind the propagation of waves. Without energy, the wave cannot transfer any information or travel through a medium. Energy is required to create the oscillations that form the wave and to sustain its motion as it moves through space or a medium. Therefore, energy is essential for the existence and movement of waves.

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• 2.

### Waves in which the particles of the medium move only in the same direction as the motion of the wave are ____ waves.

• A.

Transverse

• B.

Compressional

• C.

Uniform

• D.

Light

B. Compressional
Explanation
Compressional waves are waves in which the particles of the medium move in the same direction as the motion of the wave. This means that the particles of the medium are compressed and then expanded as the wave passes through. Examples of compressional waves include sound waves, where the particles of air vibrate back and forth in the same direction as the sound wave travels. In contrast, transverse waves are waves in which the particles of the medium move perpendicular to the direction of the wave.

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• 3.

### Waves in which the particles of the medium move only perpendicular to the motion of the wave are ____ waves.

• A.

Transverse

• B.

Compressional

• C.

Uniform

• D.

Light

A. Transverse
Explanation
Transverse waves are waves in which the particles of the medium move only perpendicular to the motion of the wave. This means that the particles oscillate up and down or side to side, while the wave itself travels in a different direction. Compressional waves, on the other hand, are waves in which the particles of the medium move parallel to the motion of the wave. Uniform and light waves do not accurately describe the specific movement of particles in a wave.

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• 4.

### Wave A carries more energy than wave B. Wave B has a smaller ____ than wave A.

• A.

Frequency

• B.

Wavelength

• C.

Speed

• D.

Amplitude

A. Frequency
Explanation
Wave A carries more energy than wave B because energy is directly proportional to frequency. The higher the frequency of a wave, the greater its energy. Therefore, wave B has a smaller frequency than wave A.

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• 5.

### For a given wave, if the frequency increases, the wavelength ____.

• A.

Increases

• B.

Decreases

• C.

Stays the same

• D.

Does not exist

B. Decreases
Explanation
When the frequency of a wave increases, the wavelength decreases. This is because frequency and wavelength are inversely proportional to each other. As the frequency increases, the number of wave cycles per second also increases. Since the speed of the wave remains constant, the distance between each wave cycle (wavelength) must decrease in order to accommodate the higher frequency. Therefore, as the frequency increases, the wavelength decreases.

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• 6.

### Sound travels faster in ____ than in water.

• A.

Air

• B.

Steel

• C.

Cork

• D.

Water vapor

B. Steel
Explanation
Sound travels faster in steel than in water because steel is a denser medium than water. The speed of sound is determined by the density and elasticity of the medium through which it travels. Since steel is denser than water, the particles in steel are closer together, allowing sound waves to propagate more quickly.

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• 7.

### The unit used to measure frequency is the ____.

• A.

Newton

• B.

Joule

• C.

Decibel

• D.

Hertz

D. Hertz
Explanation
The unit used to measure frequency is hertz. Hertz is the standard unit of measurement for frequency, representing the number of cycles or vibrations per second. It is named after Heinrich Hertz, a German physicist who made significant contributions to the study of electromagnetism and the development of radio waves.

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• 8.

### Electromagnetic waves ____.

• A.

Are compressional waves

• B.

Are transverse waves

• C.

Must have a medium

• D.

Are generated by static electricity

B. Are transverse waves
Explanation
Electromagnetic waves are transverse waves because they oscillate perpendicular to the direction of their propagation. Unlike compressional waves, which require a medium to travel through, electromagnetic waves can propagate through empty space. They are generated by the acceleration of charged particles, not static electricity specifically.

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• 9.

### Electromagnetic radiation with the shortest wavelengths is ____.

• A.

Gamma rays

• B.

Visible light

• C.

• D.

Infrared waves

A. Gamma rays
Explanation
Gamma rays have the shortest wavelengths among the given options. Electromagnetic radiation is categorized based on its wavelength, with gamma rays having the shortest wavelengths and highest energy. They are produced through radioactive decay and nuclear reactions. Gamma rays are highly penetrating and can ionize atoms, making them useful in medical imaging and cancer treatment. Visible light, radio waves, and infrared waves have longer wavelengths compared to gamma rays.

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• 10.

### Electromagnetic radiation with the longest wavelengths is ____.

• A.

Gamma rays

• B.

Visible light

• C.

• D.

Infrared waves

Explanation
Radio waves have the longest wavelengths among the given options. Electromagnetic radiation consists of waves with varying wavelengths, and radio waves have the longest wavelengths, ranging from a few centimeters to several meters. They have lower frequencies and carry less energy compared to other forms of electromagnetic radiation, such as gamma rays or visible light. Radio waves are commonly used for communication purposes, including radio and television broadcasting, as well as wireless communication technologies like Wi-Fi and Bluetooth.

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• 11.

### The electromagnetic waves that come from the sun and tanning beds (which can cause skin cancer) are ____.

• A.

• B.

Microwaves

• C.

Infrared waves

• D.

Ultraviolet rays

D. Ultraviolet rays
Explanation
Ultraviolet rays are the correct answer because they are the electromagnetic waves that come from the sun and tanning beds, and they are known to cause skin cancer. Radio waves, microwaves, and infrared waves do not have the same harmful effects on the skin as ultraviolet rays.

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• 12.

### The electromagnetic waves with wavelengths slightly longer than visible light are ____.

• A.

X-rays

• B.

Microwaves

• C.

Infrared waves

• D.

C. Infrared waves
Explanation
Electromagnetic waves with wavelengths slightly longer than visible light are called infrared waves. These waves have longer wavelengths than visible light, which allows them to carry less energy. Infrared waves are often used in applications such as remote controls, thermal imaging, and communication. They are also responsible for the heat that we feel from objects and the sun.

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• 13.

### The electromagnetic waves interacting with the water molecules in your food to make it hot are ____.

• A.

Microwaves

• B.

X-rays

• C.

Gamma rays

• D.

Ultraviolet rays

A. Microwaves
Explanation
Microwaves are a form of electromagnetic waves that have a specific frequency range that allows them to interact with water molecules. When microwaves are emitted by a microwave oven and directed towards food, the water molecules in the food absorb the microwave energy. This absorption causes the water molecules to vibrate rapidly, generating heat and thus making the food hot. Therefore, microwaves are the correct answer as they are the electromagnetic waves responsible for heating food in a microwave oven.

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• 14.

### ____ are used for medical imaging.

• A.

Gamma rays

• B.

Infrared waves

• C.

X-rays

• D.

C. X-rays
Explanation
X-rays are used for medical imaging because they have the ability to penetrate through soft tissues and create images of bones, organs, and other structures inside the body. X-rays are produced by directing a controlled amount of radiation towards the body, and the resulting image can help diagnose various medical conditions such as fractures, tumors, and infections. The high energy of x-rays allows them to pass through the body and be absorbed differently by different tissues, creating contrast in the images and aiding in the detection and treatment of diseases.

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• 15.

### Energy (in scientific terms) is defined as ______________.

• A.

Moving an object a certain distance

• B.

The force exerted on an object

• C.

The ability to do work

• D.

The side effect of drinking a red bull

C. The ability to do work
Explanation
Energy, in scientific terms, is defined as the ability to do work. Work is the transfer of energy that occurs when a force is applied to an object and it causes the object to move in the direction of the force. Therefore, energy is the capacity or potential to exert a force and cause a change or perform a task. It is not related to moving an object a certain distance, the force exerted on an object, or the side effect of drinking a red bull.

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• 16.

### A circuit that has two or more separate loops for the current go through is a ____.

• A.

Parallel circuit

• B.

Series circuit

• C.

Circuit diagram

• D.

Electron circuit

A. Parallel circuit
Explanation
A circuit that has two or more separate loops for the current to go through is called a parallel circuit. In a parallel circuit, the components are connected side by side, allowing the current to divide and flow through each path independently. This means that if one component fails or is removed, the other components will still receive current and continue to function.

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• 17.

### Using figure 7.1, what is the minimum point on the wave called?

• A.

Crest

• B.

Trough

• C.

Rarefaction

• D.

Compression

B. Trough
Explanation
The minimum point on a wave is called the trough. In figure 7.1, the trough is the point where the wave reaches its lowest displacement or amplitude. It is the opposite of the crest, which is the highest point on the wave. The trough represents the lowest point of the wave's oscillation and can be observed in various types of waves, such as water waves or sound waves.

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• 18.

### What type of wave is shown in figure 7.1?

• A.

Longitudinal

• B.

Compressional

• C.

Transverse

• D.

Tsunami

C. Transverse
Explanation
The wave shown in figure 7.1 is a transverse wave. This can be determined by observing the motion of the wave particles. In a transverse wave, the particles move perpendicular to the direction of the wave propagation. This can be seen in the figure where the wave is shown as a series of crests and troughs, with the particles moving up and down. Therefore, the correct answer is transverse.

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• 19.

### Using figure 7.1, what is the highest point on the wave called?

• A.

Crest

• B.

Trough

• C.

Rarefaction

• D.

Compression

A. Crest
Explanation
The highest point on a wave is called the crest.

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• 20.

### A wave has a speed of 250 m/s and frequency of 25 Hz.  What is the wavelength?

• A.

10.0 m

• B.

10.0 Hz

• C.

.10 m

• D.

.10 Hz

A. 10.0 m
Explanation
The wavelength of a wave can be calculated by dividing its speed by its frequency. In this case, the speed of the wave is given as 250 m/s and the frequency is given as 25 Hz. By dividing 250 m/s by 25 Hz, we get the wavelength as 10.0 m.

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• 21.

### The highest pitch humans can hear has a wavelength of 0.02 m in air and a speed of 340 m/s.  What is the frequency of this sound wave?

• A.

17000 Hz

• B.

6.8 HZ

• C.

.000588 Hz

• D.

170 Hz

A. 17000 Hz
Explanation
The frequency of a sound wave is determined by the speed of the wave divided by its wavelength. In this case, the wavelength is given as 0.02 m and the speed is given as 340 m/s. Dividing the speed by the wavelength gives a frequency of 17000 Hz.

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• 22.

### An ocean wave has a frequency of 2.5 Hz with a wavelength of 10 m.  What is the velocity of the wave?

• A.

25 m/s

• B.

.25 m/s

• C.

4 m/s

• D.

.25 m

A. 25 m/s
Explanation
The velocity of a wave can be calculated by multiplying its frequency by its wavelength. In this case, the frequency is 2.5 Hz and the wavelength is 10 m. Multiplying these values together gives us a velocity of 25 m/s.

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• Current Version
• Mar 15, 2023
Quiz Edited by
ProProfs Editorial Team
• Dec 13, 2011
Quiz Created by
Christopher Mack

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