Question

Can you please explain how you get the answer, thank you.

2. (1 point) 2. Consider sound waves from three sources. Source A emits waves with frequency 1 mHz, source B emits at 1 Hz, source C emits at 1 kHz and source D emits at 1 MHz. Ranlk the sources by ranking from smallest to largest the wavelengths of the waves. A.D<C<B<A B.A<B<C<D

Answer 1

Speed of sound wave, c = f * λ---------------------------------(i)

where, f = frequency of the wave

and λ = wavelength of the wave

Equation (i) can be written as –

λ = c / f

Speed of the wave is constant.

So, wavelength of the wave (λ) is proportional to 1/f .

Means, greater the frequency, lower the wavelength.

Given that –

A = 1 mHz = 0.001 Hz

B = 1.0 Hz

C = 1 kHz = 1000 Hz

D = 1 MHz = 1000000 Hz

So, the order of the wavelength will be –

A > B > C > D

Hence, option (A) is the correct answer.