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A girl stops singing a pure note. She is...

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 wavelengths 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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The correct Answer is:
C, D
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RESONANCE-SOUND WAVES-Exercise- 2 PART - III
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  2. S(1) and S(2) are two sources of sound emitting sine waves. The two so...

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  3. Two monochromatic sources of electomagnetic wave, P and Q emit waves o...

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  4. The energy per unit area associated with a progressive sound wave be d...

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  5. As a wave propagates,

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  6. At the closed end of an organ pipe :

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  7. A cylinderical tube, open at one end and closed at the other, is in ac...

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  8. The effect of making a hole exactly at (1//3^(rd)) of the length of th...

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  9. It is desired to increse the fundamental resonance frequency in a tube...

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  10. In a resonance tube experiment, a closed organ pipe of length 120cm is...

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  11. Two narrow organ pipes, one open (length l(1)) and the other cloed (le...

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  12. Two idential straight wires are stretched so as to produce 6 beats per...

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  13. A source and an observer are at rest w.r.t ground. Which of the follow...

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  14. A girl stops singing a pure note. She is surprised to hear an echo of ...

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  15. A sound wave of frequency f travels horizontally to the right. It is r...

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  16. In the figure shown, an observer O1 floats (static) on water surface w...

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  17. A tuning fork is vibratin with constant frequency and amplitude. If th...

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  18. Two sound waves move in the same direction in the same medium. The pre...

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  19. Two tunning forks A and B produce notes of frequencies 256 Hz & 262 Hz...

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  20. A source an an observer are at rest w.r.t ground. Which of the followi...

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