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A man stands on the ground at a fixed di...

A man stands on the ground at a fixed distance from a siren which emits a clear sound dirung night that during day. Explain Why?

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During the day, the temperature of air in maximum near the ground and it progressively diminishes upwards Therefore the velocity of sound is greater near the ground and it decreases upwards `(cpropsqrtT)`. The plane wavefronts, initially vertical, are turned upwards, so the sound rays curl up during the day. At night the conditions are reversed, so sound rays curl down, producing better audibility of distant sounds.
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CENGAGE PHYSICS ENGLISH-SOUND WAVES AND DOPPLER EFFECT-Exercise 6.1
  1. Explain: if an obeserver places hisear to one end of a long iron pipe ...

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  2. Does the velocity of sound in a solid increase significantly on heatin...

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  3. A man stands on the ground at a fixed distance from a siren which emit...

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  4. Two sound waves from two different sources interfere at a point to yie...

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  5. A sound differs by 6 dB from a sound of intensity equal to 10(nW)/(cm^...

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  6. Find the molecular weight for a gas in which the velocity of sound is ...

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  7. Seven grams of nitrogen is mixed with 12 g of oxygen in a tube and the...

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  8. Calculate the increase velocity of sound for 1^@C rise of temperature ...

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  9. If the sound level in a room is increased from 50 dB to 60 dB, by what...

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  10. Do displacement particle velocity and pressure variation in a longitud...

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  11. Why is sound wave of intensity 10^-12(W)/(m^2) and frequency 1000 Hz t...

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  12. What experimental evidence can be cited to show that the speed of soun...

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  13. Explain why the speed of sound through a gas cannot be greater than th...

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  14. Sound is more cleary heard with the wind How?

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  15. Explain: if an obeserver places hisear to one end of a long iron pipe ...

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  16. Does the velocity of sound in a solid increase significantly on heatin...

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  17. A man stands on the ground at a fixed distance from a siren which emit...

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  18. Two sound waves from two different sources interfere at a point to yie...

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  19. A sound differs by 6 dB from a sound of intensity equal to 10(nW)/(cm^...

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  20. Find the molecular weight for a gas in which the velocity of sound is ...

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