Home Physics Wave and Sound General A girl stops singing a pure note. She is sur…
Physics Wave and Sound General MCQ (Single Correct)

A girl stops singing a pure note. She is surprised to hear an echo of higher frequency, i.e., a higher musical pitch. Then:

A
there could be some warm air between the girl and the reflecting surface
B
there could be two identical fixed reflecting surfaces, one half a wavelength of the
sound wave away from the other
C
the girl could be moving towards a fixed reflector
D
the reflector could be moving towards the girl

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(c, d)

High pitch means apparent frequency is increased in reflected wave so there is relative motion between girl and reflection and it is of approaching nature so C and D is correct.

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