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A source of unknown frequency gives 4 be...

A source of unknown frequency gives 4 beats//s, when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 The unknown frequency is

A

260 Hz

B

254 Hz

C

246 Hz

D

240 Hz

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The correct Answer is:
B
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MOTION-SOUND WAVES-Exercise - 3 (Section - A)
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  4. What is your observation when two source are emitting sound with frequ...

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  6. When a string is divided into three segments of lengths l(1),l(2) a...

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  7. A source of unknown frequency gives 4 beats//s, when sounded with a so...

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  8. If we study the vibration of a pipe open at both ends, then the follow...

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  9. In astronomy, increase in wavelength due to doppler effect is known as...

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  10. If n(1), n(2 ) "and" n(3) are the fundamental frequencies of three seg...

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  11. The number of possible natural oscillations of air column in a pipe cl...

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  12. An astronomical object is moving with such a speed that red shift of 1...

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  13. The fundamental frequency of a closed organ pipe of length 20 cm is eq...

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  14. A source of sound S emitting waves of frequency 100 Hz and an observer...

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  15. A uniform string of length 20 m & mass 1 kg is hung vertically. Find t...

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  16. A siren emtting a sound of frequency 800 Hz moves away from an observe...

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  17. An air column, closed at one end and open at the other resonates with ...

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  18. The two nearest harmonics of a tube closed at one end and open at othe...

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  19. Two car moving in opposite directions approach each other with speed o...

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  20. A tuning fork is used to produce resonance in glass tuve. The length o...

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