Physical Science Unit 7 TEST

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What is the amplitude of this wave?

3

[work this one] A sound scientist hears some thunder. She knows that sound moves as a wave. She has a microphone that measures the frequency of the thunder as 100 hz. She also predicts the wavelength of sound to be about 3.40 m.​ Based on these data, determine the speed of sound.

340 m/s

Which transverse wave has the highest frequency?

4 because high frequency = low wavelength/more energy

[work this one] The blue-throated hummingbird flaps its wings 300 times a minute. What is its frequency?

5 hz

[work this one] A wave has frequency of 5 Hz and a speed of 25 m/s. What is the wavelength of the wave?

5 m

[work this one] A guitar string vibrates with a frequency of 320 hz. If the wavelength of the vibration is 0.23 meters what is the speed of the wave?

73.6 m/s

What is the Doppler Effect?

A change in frequency due to the relative motion of a wave source and an observer

What's happening at B?

A crest and a trough are combining to create destructive interference.

How far the particles vibrate away from their resting position

Amplitude

The diagram shows a displacement-time graph for a progressive wave.

Amplitude: 5 mm; Frequency: 50 Hz

What type of interference is represented in this diagram?

Constructive

What type of interference is represented in the diagram?

Destructive

This image is representing what wave interaction?

Diffraction

When the sound source moves, the frequency changes ex. police car siren sounding lower pitch after the car passes

Doppler Effect

An ambulance is driving towards you as you stand on the sidewalk. What happens to the pitch of the siren as it comes towards you?

It increases

What happens to the frequency of a wave as it passes through a gap?

No change

How much time it takes the particles to complete a vibrational cycle

Period

What are the spaced out sections of this wave called?

Rarefactions

What would you call this?

Reflection

What would you call this?

Refraction

If the distance represented by the letter A were increased, how would it change the way the sound was heard?

The sound would be louder. The higher the amplitude, the more energy and louder it is.

What's happening at A?

Two crests are combining to create constructive interference.

When comparing the two waves that are shown, how would Wave A (green wave) differ than Wave B (black wave)?

Wave A and B have the same amplitude, but wave B (black) has a lower pitch

Wavespeed =

Wavelength * Frequency

The measurement of the distance the particles move from the resting point of the wave

amplitude

When a sound is louder what measurement gets bigger?

amplitude

Which vocabulary term is used to identify the distance between points C & E?

amplitude

The part of a longitudinal wave where the particles of the medium are close together.

compression

A wave in which the wave's medium is compressed in the same direction as the movement of the wave

compression wave

Longitudinal waves have:

compressions and rarefactions

Top of the wave

crest

Bending of waves around an object (such as through a doorway)

diffract

A wave that can travel with or without a medium is called a(n)

electromagnetic wave

How often the particles vibrate about their fixed position

frequency

The number of waves that passes a certain point in a set period of time

frequency

What does pitch depend on?

frequency

A wave with a shorter wavelength will have a ______ frequency and _____ energy

high, high

What is a pitch?

highness or lowness of a sound

Sound waves are __________ waves.

longitudinal

A wave with a larger wavelength will have a ______ frequency and _____ energy

low, low

A wave that requires a medium through which to travel

mechanical wave

The matter (solid, liquid, or gas) through which waves can travel

medium

The vibrations in a longitudinal wave are __________ to the direction of energy transfer.

parallel

In a transverse wave, the vibrations are __________ to the direction of the wave.

perpendicular

A part in a longitudinal wave where the particles are spread apart

rarefaction

Which color has the lowest frequency?

red

The bouncing back of waves off an object

reflection

when a wave is bent by traveling from one medium to another

refraction

Bottom of the wave

trough

How fast the wave moves through the medium

wave speed

Distance from 'y' to 'y' is a _______

wavelength

How long the wave is

wavelength

The measurement of the length of a wave from one point of the wave to the next identical part of the wave (for example, top to top or bottom to bottom)

wavelength

Which vocabulary term is used to identify the distance between points C & G?

wavelength

Carries energy from one place to another

waves


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