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# CIE AS level Physics watch

1. A sound wave has a frequency of 2500 Hz and a speed of 1500 m s–1. What is the shortest distance from a point of maximum pressure in the wave to a point of minimum pressure?

A 0.15 m B 0.30 m C 0.60 m D 1.20 m

I used the v=f x wavelength formula to find the wavelength which is 0.6. What do they mean by "shortest distance from a point of maximum pressure in the wave to a point of minimum pressure"? The marking scheme says the answer is B. Is by wavelength/2?
2. Transverse waves have most energy/pressure at crests and the least at troughs. To find the horizontal distance between them you would divide your wavelength by two as troughs are between 2 crests. See if you can get the answer now! :P
3. (Original post by Tetisya)
A sound wave has a frequency of 2500 Hz and a speed of 1500 m s–1. What is the shortest distance from a point of maximum pressure in the wave to a point of minimum pressure?

A 0.15 m B 0.30 m C 0.60 m D 1.20 m

I used the v=f x wavelength formula to find the wavelength which is 0.6. What do they mean by "shortest distance from a point of maximum pressure in the wave to a point of minimum pressure"? The marking scheme says the answer is B. Is by wavelength/2?
Sound wave is also known as a pressure wave. The wavelength can be said to be the distance between 2 consecutive maximum pressure points or distance between 2 consecutive minimum pressure points.

In the middle of 2 consecutive maximum pressure points, there is a minimum pressure point.

4. (Original post by S.H.Rahman)
Transverse waves have most energy/pressure at crests and the least at troughs. To find the horizontal distance between them you would divide your wavelength by two as troughs are between 2 crests. See if you can get the answer now! :P
Sound wave is a longitudinal wave NOT a transverse wave.
5. (Original post by Eimmanuel)
Sound wave is a longitudinal wave NOT a transverse wave.

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