(a) Explain the terms 'crests' and 'troughs' of a wave ? What type of waves consist of crests and troughs? (b) The flash of a gun is seen by a man 3 seconds before the sound is heard. Calculate the distance of the gun from the man (speed of sound in air is 332 m/s).
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If a thunder is heared by a man 4 seconds after the lightning is seen, how far is the lighting from the man? (Speed of sound in air = 330 m//s) .
The echo of a gunshot is heard 5 seconds after it is fired. Calculate the distance of the surface which reflects the sound. The velocity of sound is 332m/s.
The echo of a sound is heard after 5 seconds. If the speed of sound in air be 342m/s, calculate the distance of the reflecting surface.
(a) Explain the terms 'compression' and rarefactions of a wave. What type of waves consist of compressions and rarefactions? (b) A worker lives at a distance of 1.32 km from the factory. If the speed of sound in air be 330m//s , how much time will the sound of factory siren take to reach the worker?
A man stands in front of a hillock and fires a gun. He hears an echo after 1.5 sec . The distance of the hillock from the man is (velocity of sound in air is 330 m/s )
The echo of a gun shot is heard 8 sec. after the gun is fired. How far from him is the surface that reflects the sound (velocity of sound in air = 350 m/s )
A man standing at 51 m from a wall fires a gun. Calculate the time after which an echo is heard. The speed of sound is 340 m//s .
LAKHMIR SINGH & MANJIT KAUR-MODEL TEST PAPER 5-Section B
