23Sound Doppler EffectMedium1 mark
A student wants to explain why the sound from a train gets louder when it gets closer.
What is the type of wave and which property of the sound causes it to be louder?
| type of wave | property | |
|---|---|---|
| A | longitudinal | wave is moving faster |
| B | longitudinal | wave has a larger amplitude |
| C | transverse | the wavelength of the wave is increasing |
| D | transverse | the frequency of the wave is increasing |