A source of sound A emitting waves of frequency 1800 Hz is falling towards ground with a terminal speed v. The observer B on the ground directly beneath the source receives waves of frequency 2150 Hz. The source A receives waves, reflected from ground, of frequency nearly : (Speed of sound =343 m/s)

  • Option 1)

    2150 Hz

  • Option 2)

    2500 Hz

  • Option 3)

    1800 Hz

  • Option 4)

    2400 Hz

 

Answers (1)

As discussed in @9344

v=\left | \frac{343}{343+v} \right | 1800=2150\:\:\:\:\:\:\:\:\:\:\:\:\:\downarrow0\:\: source

343=1.2 \times 343 + 1.2 \: V=57.16

\therefore V''= \left| \frac {343+57}{343} \right | \times 2150 = 2500 Hz


Option 1)

2150 Hz

This option is incorrect.

Option 2)

2500 Hz

This option is correct.

Option 3)

1800 Hz

This option is incorrect.

Option 4)

2400 Hz

This option is incorrect.

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