Question

A speed boat sounds its horn while moving towards the shore at 44.0 m/s . If...

A speed boat sounds its horn while moving towards the shore at 44.0 m/s . If people on the shore think the horn frequency is 84.0 Hz , what frequency did the speed boat pilot hear?

73.2 Hz
94.8 Hz
74.4 Hz
96.4 Hz
Science   Physics   
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Answer #1

This is a problem involving Doppler effect,

Observed Frequency, For a stationary observer ( people at the shore )

where,

Observed Frequency,  

Velocity of sound, It is a constant

velocity of boat,

Rearranging for Actual Frequency,  

Substituting,    Option A

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