Question

When source of sound moves towards a stationary observer, the wavelength of sound received by him ______.

विकल्प

• decrease while frequency increase 

• remains the same whereas frequency increases

• increases and frequency also increases

• decreases while frequency remains the same

Answer 1

When source of sound moves towards a stationary observer, the wavelength of sound received by him decrease while frequency increase.

Explanation:

Apparent frequency,

n_a = n`["v"/("v"-"v"_"s")]` i.e., frequency increase

As frequency increases, so wavelength decreases.