KVPY SX SB Exam 2013 Question Paper

Question : 27 of 120

Marks: +1, -0

An engine moving away from a vertical cliff blows a horn at a frequency f Its speed is 0.5% of the speed of sound in air. The frequency of the reflected sound received at the engine is

0.990f
0.995f
1.005f
1.010f

Validate

Solution:

\f_1=\f_0[\v/{\v+\v_\s}]

\f_\R=\f_1[ {\v-\v_\s}/\v]

=\f_0[{\v-\v_s}/{\v+\v_\s}]

=[1-{2\v_\s}/\v]\f

= 0.990 f

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