Physical Science Unit 7 TEST
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
