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Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 10 - Gravitation > A source of sound is travelling with a velocity of 30 ms towards a stationary observer. If actual frequency of source is 1000 Hz and the wind is blowing with velocity 20 ms in a direction at 60∘C with the direction of motion of source, then the apparent frequency heard by observer is (speed of sound is 340 ms)

A source of sound is travelling with a velocity of 30 ms towards a stationary observer. If actual frequency of source is 1000 Hz and the wind is blowing with velocity 20 ms in a direction at 60∘C with the direction of motion of source, then the apparent frequency heard by observer is (speed of sound is 340 ms)

Energy required to move a body of mass m from an orbit of radius 2R to 3R is (where M= mass of earth R= radius of earth)