Topic 4 & 5 Waves, light and the EM Spectrum Flashcards
Name three different types of wave.
any three from: light, sound, waves on water, seismic waves
What property of a wave does the wavelength describe?
the distance from one wave to the same place on the next wave
What are the units for wavelength?
metres
What property of a wave does the frequency describe?
the number of waves per second
What are the units for frequency?
hertz
What is transferred by a wave?
energy
What does amplitude mean?
the height of a wave, more correctly, the maximum displacement of a particle from its rest position
In which direction do the particles in a sound wave move compared to the direction the wave is travelling?
backwards and forwards in the same direction as the wave
What word is used to describe waves like sound waves?
longitudinal
What word is used to describe waves like the waves on water?
transverse
Name a type of transverse wave.
waves on water, some seismic waves, light waves
Name a type of longitudinal wave.
sound, some seismic waves
What is the difference between longitudinal and transverse waves?
the direction the particles move compared to the direction the wave is travelling
What word describes the number of waves per second?
frequency
What word describes the time taken for one wave to pass?
period
What word describes the distance between a point on one wave and the same point on the next wave?
wavelength
What are the units for frequency?
hertz
Name two things that waves can transfer.
energy and information
Name one thing that waves do not transfer.
matter
What is the equation that links wave speed, frequency and wavelength?
wave speed=frequency x wavelength
What two things do you need to measure to find the speed of a wave?
either the time to cover a certain distance, or the wavelength and the frequency
Describe the path of light when you watch TV.
TV to eye
Describe the path of light when you sit underneath a lamp and read a book.
lamp to book to eye
What is the word that describes light bouncing off a material?
reflection
What does refraction mean?
changing the direction of a wave
When does refraction happen to light waves?
when light goes into or out of a material
Name three materials that light can travel through.
any three transparent materials, such as air, glass, water, Perspex
Why is it difficult to see the exact positions of objects on the bottom of a swimming pool?
light is refracted as it leaves the water
What does the frequency of a wave describe?
number of waves per second
What are the units for frequency?
hertz