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  • Can someone help me with this, A motorcycle starts from rest and accelerates along a straight path at 2 m/s2. At the starting point of the motorcycle there is a stationary electric siren. How far has the motor cycle gone when the driver hears the fre

A motorcycle starts from rest and accelerates along a straight path at 2 m/s2. At the starting point of the motorcycle there is a stationary electric siren. How far has the motor cycle gone when the driver hears the frequency of siren at 94% of its value when the motor cycle was at rest.

  • Option 1)

    49 m

  • Option 2)

    98 m

  • Option 3)

    147 m

  • Option 4)

    196 m

 

Answers (1)

best_answer

\frac{n'}{n}= \left [ \frac{v-v_{l}}{v} \right ]\Rightarrow 0.94= \left ( \left [ \frac{330- v_{l}}{330} \right ] \right )

v_{l}=19.8m/s

v^{2}=u^{2}+ 29s u= 0

s= \frac{v^{2}}{2a}= 98m

 

Frequency of sound when source & observer are moving away from each other -

\nu {}'= \nu _{0}.\frac{C-V_{0}}{C+V_{s}}
 

- wherein

C= Speed of sound

V_{0}= Speed of observer

V_{s}= speed of source

\nu _{0 }= Original frequency

\nu {}'= apparent frequency

 

 


Option 1)

49 m

This is incorrect

Option 2)

98 m

This is correct

Option 3)

147 m

This is incorrect

Option 4)

196 m

This is incorrect

Posted by

divya.saini

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