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 ? for this sound such that
A) f > 1000 Hz and ? > 0.343 m.
B) f > 1000 Hz and ? = 0.343 m.
C) f > 1000 Hz and ? < 0.343 m.
D) f = 1000 Hz and ? < 0.343 m.
B
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