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CP4F

GCSE Combined Science Physics

QuestionAnswer
What do waves carry? They carry energy
Describe Transverse wave The vibration causing the wave is perpendicular to the direction of in which the wave is travelling
What type of waves are sound waves ? Longitudinal
How do the particles move when a longitudinal wave passes through them? They move backwards and forwards
What other types of wave are longitudinal? Primary seismic waves.
What type of waves are electromagnetic waves? They are transverse
What is the frequency of a wave? The number of waves passing a point each second.
What is the time period of a wave? The length of time it takes for one wave to pass a given point
What is the amplitude of a wave? " Maximum distance of a point on the wave away from its rest position
" What unit is frequency measured in? "Hertz
" What unit is wavelength measured in? Meters
What are the two equations for wave speed? Wave speed= frequency x wavelength Wave speed =distance/time
A wave travels 56 m in 7 seconds, what is its wave speed Wave speed =distance/time =56/7=8m/s
A wave travels at 10m/s, how far will it travel in 8 seconds? Distance = speed x time =10x 8 =80m
A wave has a frequency of 20Hz and a wavelength of 8m, what is its wave speed? Wave speed= frequency x wavelength = 20 x 8= 160m/s
wave has a wavelength of 20cm and has a frequency of 20kHz, what is its wavelength in m/s? "Wave speed= frequency x wavelength= 20000x 0.2 =4000m
" A wave travels at 5m/s and has a wavelength of 20cm, what is its frequency? frequency = speed/wavelength = 5/0.2 =25Hz
When do waves change their direction? When they move into a different medium
What is the name given to the boundary between 2 mediums? Interface.
What is the normal? A line at 90 degrees to the interface
What happens when line travels along the normal? It travels in a straight line but will change its speed at the interface.
How does the direction of light change when it moves from glass to air? It moves away from the normal.
What happens to the frequency of the waves when they refract? It stays the same.
What happens to the speed of water waves as they travel from deep to shallow water? They slow down
In which material glass or air does light travel the fastest? Air
Name an example of a transverse wave light, water, any electromagnetic
Name an example of a longitudinal wave Sound
Oscillations are along the same direction as the direction of travel is a _________ wave longitudinal
Oscillations are at right angles to the direction of travel in a ____________ wave transverse
The region in a longitudinal wave where particles are closest together is a … compression
The region in a longitudinal wave where particels are furthest apart is a… rarefaction
What do all waves transfer? Energy
Why can we see the sun but not hear it? Light can travel through a vacuum, sound cannot
The pitch of a sound is related to its Frequency
The colour of light is related to its Frequency
The maximum displacement of a point on a wave away from its rest position is the… Amplitude
The distance from a point on one wave to the equivalent point on the next wave is the … wavelength
The number of waves passing a point each second is the… Frequency
The time needed for one wave to pass a given point is the… period
An object is said to _________ radiation when energy from an EM wave is taken up by the object absorb
An object is said to _________ radiation when a wave can pass through the object transmit
The process taking place when a wave bounces off of a surface reflection
The process taking place when a wave enters a different density medium and changes direction refracion
Refraction changes both the _________ and ___________ of a wave direction and speed
Which two angles are equal in reflection angle of incidence and angle of reflection
Draw a transverse wave and label the wavelength and amplidtue teacher to draw on board…
Draw a longitudinal wave and label the wavelength teacher to draw on board…
Write the equation linking frequency, wavelength and wave speed v = fλ
What is the unit of frequency? Hertz (Hz)
What is the unit of wavelength? metres (m)
What is the unit of wave speed? metres per second (m/s)
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