Physics · 2016
JEE Main · 10 April 2016, Shift 1 · Q11
A toy-car, blowing its horn, is moving with a steady speed of 5 m/s, away from a wall. An observer, towards whom the toy car is moving, is able to…
A toy-car, blowing its horn, is moving with a steady speed of $\displaystyle 5$ m/s, away from a wall. An observer, towards whom the toy car is moving, is able to hear $\displaystyle 5$ beats per second. If the velocity of sound in air is $\displaystyle 340$ m/s, the frequency of the horn of the toy car is close to :
Official answer
(4)
$\displaystyle 170$ Hz
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JEE Main 2016 Physics question, with the answer from NTA’s final answer key. Where our answers come from.