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Which of the following statements are in...

Which of the following statements are incorrect?

A

Wave pulses in strings are transverse waves.

B

Sound waves in air are transverse waves of compression and rarefaction.

C

The speed of sound in air at `20^@C` is twice that at `5^@C`.

D

A 60dB sound has twice the intensity of a 30 dB sound.

Text Solution

Verified by Experts

The correct Answer is:
B, C, D
`vpropsqrtT`
`60dB=10log((I_1)/(I_0))`
`30dB=10log((I_2)/(I_0))`
`30=10log((I_1)/(I_2))implies(I_1)/(I_2)ne2`
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Knowledge Check

  • Which of the following statements is incorrect ?

    A
    Pure water and vegetable oil are transparent in nature
    B
    Muddy water and fog are translucent materilas.
    C
    Chlorine and nitrogen dioxide are colourless, translucent gases.
    D
    Wood and metals are opaque.

  • Which of the following statements is incorrect?

    A
    Sound travels faster in summer than in winter.
    B
    Sound travels in a straight line.
    C
    Sound travels faster in vacuum than in air.
    D
    Sound travels in the form of longitudinal mechanical waves.
    • CENGAGE PHYSICS-SOUND WAVES AND DOPPLER EFFECT-Multiple Correct
    1. Which of the following statements are incorrect?

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    2. A source S of sound wave of fixed frequency N and an observer O are lo...

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    3. A vibrating tuning fork is first held in the hand and then its end is ...

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    4. A source of sound and detector are moving as shown in Fig. at t=0. Tak...

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    5. Which of the following statements are correct?

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    6. Consider a souce of sound S, and an observer/detector D. The source em...

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    7. An observer A is moving directly towards a stationary sound source whi...

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    8. A sonic source, located in a uniform medium, emits waves of frequency ...

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    9. Plane harmonic waves of frequency 500 Hz are produced in air with disp...

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    10. A driver in a stationary car blows a horn which produces monochromatic...

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

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    12. Which of the following statements are incorrect?

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    13. A source S of sound wave of fixed frequency N and an observer O are lo...

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      |

    14. A vibrating tuning fork is first held in the hand and then its end is ...

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      |

    15. A source of sound and detector are moving as shown in Fig. at t=0. Tak...

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      |

    16. Which of the following statements are correct?

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    17. Consider a souce of sound S, and an observer/detector D. The source em...

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      |

    18. An observer A is moving directly towards a stationary sound source whi...

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      |

    19. A sonic source, located in a uniform medium, emits waves of frequency ...

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      |

    20. Plane harmonic waves of frequency 500 Hz are produced in air with disp...

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      |