A Stationary Siren Emits Sound of Frequency 1000 Hz and Wavelength

question 11

Multiple Choice

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.

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