Topic 4 Waves Flashcards
Q – What is frequency defined as?
A – the no. of waves per second
Q – 3 waves measure 18m long. What is the wavelength?
A – 6m
Q – as light enters a glass block from air it will refract. What happens to the wavelength and speed of the light?
A – the wavelength and speed of the light will decrease.
Q – Give 3 examples of a Transverse wave
A – any of the EM waves
Q – What 4 possible things might a wave do if it hit a surface?
A – Transmit / Absorb / Reflect / Refract.
Q – Give an example of a longitudinal wave
A – Sound
Q – what equation is used to calculate wave speed?
A – Wave speed = frequency x wavelength
Q – Waves carry energy and not matter. What does this mean?
A – the particles only vibrate as they pass the energy on. They don’t actually move through the wave.
Q – if we doubled the frequency of a wave then what would happen to its wavelength?
A – it would half.
Q – How do we define a Transverse wave?
A – the particles vibrate at 90 degrees to the direction of the wave.
Q – A man is playing a note on a flute. The amplitude of the note then increases. How would the sound change?
A – it would get louder.
Q – How do you calculate the frequency of a wave if you know the time period?
A – Frequency = 1 / Time period
Q – as light enters a glass block from air it will refract. What happens to the wavelength and speed of the light?
A – the wavelength and speed of the light will decrease.
Q – which type of waves will speed up as they travel into a more dense medium
A – longitudinal waves – (sound or P-waves)