A police siren emits sinusoidal waves with frequency 300Hz. If the siren is at r

Question

A police siren emits sinusoidal waves with frequency 300Hz. If the siren is at rest and listener is in a car moving towards the siren with 30m/s speed what frequency docs the listener hear? (Speed of sound 340 m/s) 274 Hz 327 Hz 250 Hz 350 Hz A 0.5 kg harmonic oscillator has a total mechanical energy of 4.1 J. If the oscillation amplitude is 20.0 cm. what is the oscillation frequency? 1.4 Hz 3.2 Hz 2.3 Hz 4.6 Hz An astronaut has landed on Planet N-40 and conducts an experiment to determine the acceleration due to gravity on that planet. She uses a simple pendulum that is 0.640 m long at measures that 10 complete oscillations 26.0 s. What is the acceleration of gravity on Planet 40? 4.85 m/s^2 3.74 m/s^2 1.66 m/s^2 9.81 m/s^2

Explanation / Answer

3] By doplers formula,

f' = f*[v+vs]/vs

= 300*[340+30]/340

= 327 Hz

option b is correct

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