stationary siren emits a sound with a frequency of 1000 Hz and a wavelength of 0.343 m. An observer moving towards the siren will measure a frequency f and a wavelength λ for this sound so that Select one: to. 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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