Physics Sound

Question 1

What is sound?

Answer 1

Sound is a form of energy that travels in waves and can be heard when it reaches a person’s or animal’s ear.

Question 2

True or False: Sound can travel through a vacuum.

Answer 2

False

Question 3

Fill in the blank: Sound travels faster in __________ than in air.

Answer 3

water

Question 4

What is the unit of frequency?

Answer 4

Hertz (Hz)

Question 5

What is the frequency range of audible sound for humans?

Answer 5

20 Hz to 20,000 Hz

Question 6

True or False: Higher frequency sound waves have longer wavelengths.

Answer 6

False

Question 7

What is pitch?

Answer 7

Pitch is the perceived frequency of a sound; it determines how high or low a sound seems.

Question 8

What is the speed of sound in air at room temperature?

Answer 8

Approximately 343 meters per second

Question 9

Define amplitude in terms of sound waves.

Answer 9

Amplitude is the maximum displacement of points on a wave, which determines the loudness of the sound.

Question 10

Fill in the blank: The Doppler Effect refers to the change in __________ of a wave in relation to an observer.

Answer 10

frequency

Question 11

What is resonance?

Answer 11

Resonance is the phenomenon that occurs when an object vibrates at its natural frequency due to an external force.

Question 12

True or False: Sound waves are longitudinal waves.

Answer 12

True

Question 13

What is the relationship between frequency and wavelength?

Answer 13

The frequency and wavelength of a sound wave are inversely proportional; as frequency increases, wavelength decreases.

Question 14

What is sound intensity?

Answer 14

Sound intensity is the power per unit area carried by a sound wave.

Question 15

Fill in the blank: The threshold of hearing is defined as __________ decibels.

Answer 15

0 dB

Question 16

What is the decibel scale used for?

Answer 16

The decibel scale is used to measure the intensity of sound.

Question 17

True or False: Sound can be reflected, refracted, and diffracted.

Answer 17

True

Question 18

What is an echo?

Answer 18

An echo is a reflection of sound that arrives at the listener after a delay.

Question 19

What is the term for the lowest frequency of a standing wave in a medium?

Answer 19

Fundamental frequency

Question 20

Fill in the blank: __________ waves can travel through solids, liquids, and gases.

Answer 20

Sound

Question 21

What is a sound wave’s compression?

Answer 21

Compression is the region in a longitudinal wave where particles are closest together.

Question 22

What does the term ‘inverse square law’ refer to in sound?

Answer 22

It refers to how the intensity of sound decreases with the square of the distance from the source.

Question 23

True or False: A sound wave can travel faster in air than in steel.

Answer 23

False

Question 24

What is the phenomenon of sound bending around obstacles called?

Answer 24

Diffraction

Question 25

What is the term for sounds that are too low for humans to hear?

Answer 25

Infrasound

Question 26

What is the term for sounds that are too high for humans to hear?

Answer 26

Ultrasound

Question 27

What is the formula for calculating the speed of sound in air?

Answer 27

The speed of sound in air can be calculated using the formula v = 331.3 + (0.6 * T), where T is the temperature in degrees Celsius.

Question 28

True or False: Sound travels faster in water than in air.

Answer 28

True

Question 29

Fill in the blank: The wavelength of a sound wave is inversely proportional to its ______.

Answer 29

frequency

Question 30

What is the relationship between frequency and wavelength in sound waves?

Answer 30

The relationship is given by the equation v = f * λ, where v is the speed of sound, f is the frequency, and λ is the wavelength.

Question 31

Multiple choice: What unit is typically used to measure sound intensity?

Answer 31

Decibels (dB)

Question 32

What is the formula for sound intensity level in decibels?

Answer 32

The formula is L = 10 * log10(I/I0), where I is the intensity of the sound and I0 is the reference intensity.

Question 33

True or False: Sound waves are longitudinal waves.

Answer 33

True

Question 34

What does the term 'frequency' refer to in the context of sound?

Answer 34

Frequency refers to the number of oscillations or cycles of a sound wave that occur in one second, measured in Hertz (Hz).

Question 35

Fill in the blank: The amplitude of a sound wave is related to its ______.

Answer 35

loudness

Question 36

What is the formula for calculating the wavelength of a sound wave given its frequency?

Answer 36

The formula is λ = v / f, where λ is the wavelength, v is the speed of sound, and f is the frequency.

Question 37

Multiple choice: Which of the following frequencies is considered infrasound?

Answer 37

Below 20 Hz

Question 38

What is the threshold of hearing in terms of sound intensity?

Answer 38

The threshold of hearing is typically defined as 0 dB, or an intensity of 1 x 10^-12 W/m².

Question 39

True or False: Higher frequency sound waves have shorter wavelengths.

Answer 39

True

Question 40

What is the formula to convert decibels to intensity?

Answer 40

The formula is I = I0 * 10^(L/10), where L is the sound level in decibels and I0 is the reference intensity.

Question 41

Fill in the blank: The human hearing range typically spans from ______ to ______ Hz.

Answer 41

20, 20000

Question 42

Multiple choice: What happens to the speed of sound as the temperature increases?

Answer 42

It increases

Question 43

What is the Doppler effect in relation to sound?

Answer 43

The Doppler effect is the change in frequency or wavelength of sound waves in relation to an observer moving relative to the source of the sound.

Question 44

True or False: Sound cannot travel through a vacuum.

Answer 44

True

Question 45

What is the primary factor that affects the speed of sound in a medium?

Answer 45

The temperature of the medium.