Doppler effect: A stationary siren emits sound of frequency 1000 Hz and wavelength 0.343 m. An observer who is moving toward the siren will measure a frequency f and wavelength λ for this sound such that A) f 1000 Hz and λ 0.343 m. B) f 1000 Hz and λ = 0.343 m. C) f 1000 Hz and λ

Question

Doppler effect: A stationary siren emits sound of frequency 1000 Hz and wavelength 0.343 m. An observer who is moving toward the siren will measure a frequency f and wavelength λ for this sound such that A) f > 1000 Hz and λ > 0.343 m. B) f > 1000 Hz and λ = 0.343 m. C) f > 1000 Hz and λ < 0.343 m. D) f = 1000 Hz and λ < 0.343 m.

Quizplus · Accepted Answer

The Doppler effect causes the observed frequency to increase (f > 1000 Hz) as the observer moves towards the source. However, the wavelength (λ) of the sound wave in the medium does not change due to the motion of the observer, so λ = 0.343 m.

Doppler Effect: a Stationary Siren Emits Sound of Frequency 1000