Question

An observer starts moving with uniform acceleration a toward a stationary sound source emitting a whistle of frequency n. As the observer approaches source, the apparent frequency n' heard by the observer varies with time as –

• A.
• B.
• C.
• D.

Answer 1

Answer: (B)

Answer 2

u = 0

a = constant

v₀ = u + at = at

n' = $\left( \frac { v + v _ { 0 } } { v } \right)$ n = n +