LAKHMIR SINGH & MANJIT KAUR|Exercise NCERT BOOK QUESTIONS AND EXERCISES|3 Videos
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An engine approaches a hill with a constant speed. When it is at a distance of 0.9 km, it blows a whistle whose echo is heard by the driver after 5 seconds. If the speed of sound in air is 330 m/s, then the speed of the engine is :
A man claps his hands near a mountain and hears the echo after 4 seconds. If the speed of sound under these conditions be 330m//s , calculate the distance of the mountain frm the man.
A engine is approaching a hill at constant speed. When it is at a distance of 0.9 km , it blows a whistle, whose echo is heard by the driver after 5 s . If the speed of sound is 340 m//s , calculate the speed of the engine.
The echo of a gunshot is heard 10 seconds after it is fired. If the velocity of sound is 330 m/s, the distance of the surface which reflects the sound is
A man fires a bullet standing between two cliffs. First echo is heard after 3 seconds and second echo is heard after 5 seconds. If the velocity of sound is 330 m/s , then the distance between the cliffs is
An echo is heard when minimum distance of the reflecting surface is –
LAKHMIR SINGH & MANJIT KAUR-MODEL TEST PAPER 5-Section B
