1. The vibrating bodies produce waves in the form of ………
2. For the propagation of sound, a ………. is required.
3. The frequency range of audible waves is ………..
4. The frequency of infrasonic waves is …………
5. The sound waves with a frequency greater than 20 KHz are known as ………..
6. The wavelength of sound waves ranges from ………..
7. Sound waves are ……….
8. If wavelength of a wave is λ and its time period is T, then velocity of sound wave is ………..
9. If n is the frequency and λ is the wavelength of sound wave then is velocity of wave is given by …………
10. The ascending order of velocity of sound in solids, liquids and gases is given by …………
11. Velocity of sound in a gas is inversely proportional to the ………… of the medium.
12. Velocity of sound in solid is directly proportional to the square root of the ……….. of the medium.
13. Sound can be heard from long distances clearly during …………..
14. When the temperature of a gas changes by one degree Celsius, the velocity of sound changes by ………..
15. In the case of reflection of sound, angle of incidence is equal to ………….
16. When sound waves undergo reflection by convex surface, its intensity is ………..
17. ……….. are used when sound waves have to be focused at a point.
18. In ……….. surfaces, sound from one focus will always be reflected to the other focus.
7. Sound waves are ……….
8. If wavelength of a wave is λ and its time period is T, then velocity of sound wave is ………..
9. If n is the frequency and λ is the wavelength of sound wave then is velocity of wave is given by …………
10. The ascending order of velocity of sound in solids, liquids and gases is given by …………
11. Velocity of sound in a gas is inversely proportional to the ………… of the medium.
12. Velocity of sound in solid is directly proportional to the square root of the ……….. of the medium.
13. Sound can be heard from long distances clearly during …………..
14. When the temperature of a gas changes by one degree Celsius, the velocity of sound changes by ………..
15. In the case of reflection of sound, angle of incidence is equal to ………….
16. When sound waves undergo reflection by convex surface, its intensity is ………..
17. ……….. are used when sound waves have to be focused at a point.
18. In ……….. surfaces, sound from one focus will always be reflected to the other focus.
29. If the apparent frequency is n' = \(\frac{V}{V+V_S}\) n then source moves ………….. the ……….. listener.
30. If a listener moves towards the ………. source, the apparent frequency n' = \(\frac{V+V_L}{V}\)n.
