1. Equation of a plane progressive wave is given by y = 0.6 sin 2π(t-x/2). On reflection from a denser medium, its amplitude becomes 2/3 of the amplitude of the incident wave

2. Water waves produced by a motorboat sailing in water are

3. Four wires of identical lengths, diameters and material and stretched on a sonometer box. The ratio of their tension is 1 : 4 : 9 : 16. the ratio of their fundamental frequencies is

4. The extension in a string, obeying Hookes law is X. The speed of sound in the stretched string is V. If the extension in the string is increased to 1.5 X, the speed of sound will be

5. The speed of sound in a medium depends upon

6. Speed of sound wave in air

7. Decibel is the anil of:

8. Transverse are generated in two uniform wires A and B by attaching their free ends to a vibrating source of frequency 600 Hz. The diameter of wire A is one-third that of wire B and tension in the wire A is double that in wire B. What is the ratio of velocities of waves of waves in wire A and B?

9. The factor that helps to recognise a person by his voice is

10.  With the propagation of longitudinal waves through a medium, the quantity transmitted is

11. Which of the following statements are true for wave motion?

12. Whenever a wave enters from one medium to the another, its

13. String is in fundamental mode of vibration then velocity is directly proportional to _______

14. The equation of wave traveling along string is y = 3 cos p (100t – x) in C.G.S. unit then wavelength is

15. With the increase in temperature, the frequency of the sound from an organ pipe

16. To demonstrate the phenomenon of beats we need

17. When a compression is incident on rigid wall it is reflected as

18. A whistle giving out 450 Hz approaches a stationary observer at a speed of 33 m/s. The frequency heard by the observer in Hz is

19. The velocity of sound in a gas is proportional to :

20.  A sound wave is passing through the air column in the form of compression and rarefaction. In consecutive compressions and rarefactions,