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A stationary siren emits a sound of a frequency of 1000 Hz and a wavelength 0.343 m. An observer who is moving toward the siren

A stationary siren emits a sound of a frequency of 1000 Hz and a wavelength 0.343 m. An observer who is moving toward the siren will measure a frequency f and wavelength for this sound such that

f > 1000 Hz and > 0.343 m.

f = 1000 Hz and < 0.343 m.

f > 1000 Hz and = 0.343 m.

f > 1000 Hz and < 0.343 m.

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