A sound wave of frequency 400 Hz is travelling in air at a speed of 320m/s.
1. The speed of sound wave in vaccum is______
- 320m/s more than
- 320m/s less than
- 320m/s Zero
2. What is the wavelength of the above wave?
3. Calculate the difference in phase between two points on the wave 0.2m apart in the direction of travel.