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Sound waves travel at 350 m/s through a ...

Sound waves travel at 350 m/s through a warm air and at 3500 m/s through brass. The wavelength of a 700 Hz acoustic wave as it enters brass from warm air …

A

decreases by a factor 10

B

increases by a factor 20

C

increases by factor 10

D

decreases by a factor 20

Text Solution

Verified by Experts

The correct Answer is:
C
We have `v = f lamda implies v prop lamda ( because f =` constant)
`therefore (v _(1))/( v _(2)) = (lamda _(1))/( lamda_(2)) implies (350 )/( 3500) =(lamda_(1))/( lamda_(2)) implies lamda_(2) = 10 lamda_(1)`
`therefore` Wavelength becomes 10 times its initial value.
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KUMAR PRAKASHAN-WAVES-SECTION-E (Multiple Choice Questions (MCQs)) (MCQs asked in Gujarat Board and Competitive Exams)
  1. A tuning fork of frequency 512 Hz makes 4 beats per second with the vi...

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  2. Two waves are represented by the equations y (1) = a sin (omega t + k...

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  3. Sound waves travel at 350 m/s through a warm air and at 3500 m/s throu...

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  4. Two identical piano wires kept under the same tension T have a fundame...

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  5. A wave travelling in the +ve X-direction having maximum displacement a...

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  6. If n (1), n (2), and n (3) are the fundamental frequencies of three s...

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

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

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  9. For a string, tied with two fixed rigid supports, scparated by 75 cm h...

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  10. A siren emitting a sound of frequency 800 Hz moves away from an observ...

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  11. For one resonance tube, a tuning fork produces resonance when air colu...

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  12. A uniform rope of length L and mass m, hangs vertically from a rigid s...

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  13. The second overtone of an open organ pipe has the same frequency as th...

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  14. Three sound waves of equal amplitude have frequencies (n-1), n, (n + 1...

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  15. When I m long metallic rod is vertically dropped it strikes the solid ...

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  16. When two organ pipes with fundamental frequencies n(1) and n(2) are c...

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  17. A tuning fork is used to produce resonance in a glass tube. The length...

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  18. Fundamental frequency of one open pipe is equal to third harmonic of c...

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  19. An organ pipe closed at one end has fundamental frequency of 1500 Hz. ...

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  20. A stone thrown into still water, creates a circular wave pattern movin...

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