waves Flashcards
How do you calculate the time period of a full cycle of a wave?
Time period= 1/frequency
T=1/f
How do you calculate speed?
Speed= distance/ time
V=d/t
How do you calculate the speed of a wave?
v= f λ
wave speed = frequency × wavelength
What is the rest postion?
Particles or fields when they aren’t vibrating
what is displacement?
Distance that a point, in the medium, has moved from it’s rest position
Define the peak of a wave
Highest point above the rest position
Define the trough of a wave
Lowest point below the rest position
Define amplitude
The height of the wave from the peak to the mid point
Define wavelength
the distance between two successive points
(peak-peak or trough-trough)
Define time period
Time taken for one oscillation
Define frequency
The number of waves per second
what two words are used to describe waves?
Oscillations
Vibrations
what is the job of a wave?
To transfer energy between stores
Complete the sentence:
Sound waves cause air particles to vibrate ____ and _____.
Back
Forth
Complete the sentence:
Ripples cause _____ particles to vibrate __ and ____.
Water
Up
Down
What is a longitudinal wave?
Parallel vibrations to direction of wave travel
What is a transverse wave?
Perpendicular vibrations to direction of wave travel
What are mechanical waves?
Oscillations of particles in a solid, liquid, or gas.
(Extra info: It must have a medium to travel through)
What are Electromagnetic waves?
Oscillations in and electric or magnetic field
What is the unit for wave speed?
meters per second- m/s
What is the unit for frequency?
Hertz- Hz
What is frequency (λ) measured in?
Meters
True or false:
Sound is faster than light?
False
True or false:
Light is faster than sound?
True
When sound is created, air particles vibrate and collide with each other. Why is this?
The vibrations pass through the air particles
What is the accepted value for the speed of sound in the air?
330 m/s
What is the aim when doing a ripple tank practical?
To measure the frequency, wavelength, and the speed of waves in the tank
What are the risks/hazards of the Ripple Tank practical?
Electrical components are near water- could cause shock and damage to components.
True or false:
Longitudinal waves show areas of compression and rarefaction
True
Define compression:
Areas of high pressure due to particles being close together
Define rarefaction:
Areas of low pressure due to particles being spread further apart
What is echolocation?
The prime mechanism that is behind or responsible for sonar.
What does Sonar stand for?
Sound, navigation, and, ranging
The time difference between transmitting and receiving the final time - the initial time.
Δt= ts -ti
