Question

Waves Unit Test
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Question
The table below shows the speed of sound in water at different temperatures and salinities.

Speed of Sound in Water at Different Temperatures and Salinities
Temperature (°C) 0 10 20 30
Speed of sound in freshwater (ms
) 1,403 1,447 1,481 1,507
Speed of sound in seawater (ms
) 1,449 1,490 1,522 1,546
Which statement can be inferred about the speed of sound in freshwater and in seawater?

(1 point)
Responses

At 80°C, the speed of sound in freshwater and seawater will be the same.
At 80°C, the speed of sound in freshwater and seawater will be the same.

The speed of sound increases as the density of water increases.
The speed of sound increases as the density of water increases.

Both temperature and salinity decrease the speed of sound in water.
Both temperature and salinity decrease the speed of sound in water.

The speed of sound increases as the salinity of water decreases.

Answer 1

Both temperature and salinity decrease the speed of sound in water.

Answer 2

Two similar waves are traveling through the same medium. Wave A has a frequency that is 3 times that of wave B.

How do their wavelengths compare?

(1 point)
Responses

λA=13λB
lambda sub cap A is equal to 1 third lambda sub cap b

λA=19λB
lambda sub cap A is equal to 1 ninth lambda sub cap b

λA=λB
lambda sub cap A is equal to lambda sub cap b

λA=3λB
lambda sub cap A is equal to 3 lambda sub cap b

Answer 3

λA=13λB

Answer 4

In one or two sentences, make and justify a claim about two aspects of the picture that illustrate behaviors of light.

The picture is of mountian and trees with the refelction of them on the water below them.

Answer 5

The reflection of the trees and mountains on the water demonstrate the phenomenon of reflection in light, while the way the colors and shapes are distorted in the reflection is an example of the refraction of light.

Answer 6

In one to two sentences, describe the relationship between harmonics and resonance frequency in a piano.(2 points)

Answer 7

Harmonics are related to resonance frequencies in a piano because the natural frequencies of the vibrating strings produce harmonics in multiples of the fundamental frequency, contributing to the overall resonance and sound quality of the instrument.

Answer 8

In one to two sentences, describe the relationship between harmonics and resonance frequency in a piano. write it simply

Answer 9

A piano produces harmonics in multiples of the fundamental frequency, which contribute to the overall resonance and sound quality of the instrument.

Answer 10

Sound travels through a guitar string at 600 m/s, making a sound wave in the air with a speed of 333 m/s. In 1–2 sentences, explain how the wavelength and frequency of the wave in the string compare to the wavelength and frequency of the wave in the air.(2 points)

Answer 11

The wavelength of the sound wave in the guitar string is inversely proportional to its frequency, whereas the wavelength of the sound wave in the air is directly proportional to its frequency. Therefore, the wavelength and frequency of the wave in the string will be different than the wavelength and frequency of the wave in the air.