Question

A wave of periodic time 0.004 s travels with a speed of 4.8 km s-1in iron. What will be its wavelength in: i)Ironii)Air? (Take speed of sound in air as 332 m s-1.)]

Answer 1

Answer:

Explanation:

since v=f×λ

330=f×3.3

f=100 Hz .

Answer 2

Answer:

wavelength in iron =  19.2 m

wavelength in air =  1.32 m

Explanation:

The time period of the wave (T) = 0.004 sec.

Speed of the wave (in iron) = 4800 km/s.

We know the equation that:

v = λ / T ----------------------(1)

Where,

v = speed of the wave in a given medium.

T = time period of the wave in that medium.

λ = wavelength of the wave in that medium.

=> λ = v x T

λ(iron) = 4800 x 0.004 =  19.2 m

λ(air) = 332x 0.004 =  1.32 m