6. Velocity of a light wave is :
(a) 332 m/sec
(b) 3 x 108 m/sec
(c) 3 x 10-8 m/sec
(d) -332 m/sec
7. Velocity of a sound wave is :
(a) 332 m/sec
(b) 3 x 108 m/sec
(c) 3 x 10-8 m/sec
(d) -332 m/sec
8. The velocity of sound in air is independent on the change in :
(a) Pressure
(b) Density
(c) Temperature
(d) Humidity
9. The speed of sound will be greatest in :
(a) Air
(b) Vaccum
(c) Water
(d) Metal
10. The unit of intensity of sound is :
(a) Volt
(b) Hz
(c) Decibel
(d) Joule
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