Question

A source emits radio signals of 100 MHz and
moves towards an observer with a speed of
9Kms. The apparent change in the frequency
of the signals is
​

Answer 1

Explanation:

When the air columns in two pipes closed at one end of lengths 62 cm and 63 cm

are vibrating in fundamental mode, 7 beats are heard in 3 second. Neglecting end

correction, calculate velocity of sound in air.