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Flash and thunder are produced simultane...

Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why ?

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MBD -HARYANA BOARD-SOUND-Example
  1. Which characteristic of the sound helps you to identify your friend by...

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  2. Which characteristic of the sound helps you to identify your friend by...

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  3. Flash and thunder are produced simultaneously. But thunder is heard a ...

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  4. A person has a hearing range from 20 Hz to 20 kHz. What are the typica...

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  5. Two children are at opposite ends of an aluminium rod. One strikes the...

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  6. The frequency of a source of sound is 100 Hz. How many times does it v...

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  7. Does sound follow the same laws of reflection as light does ? Explain.

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  8. When a sound is reflected from a distant object, an echo is produced. ...

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  9. Give two practical applications of reflection of sound waves.

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  10. A stone is dropped from the top of a tower 500 m high into a pond of w...

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  11. A sound wave travels at a speed of 339 m//s. If its wavelength is 1.5 ...

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  12. What is reverberation ? How can it be reduced ?

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  13. What is loudness of sound ? What factors does it depend on ?

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  14. Explain how bats use ultrasound to catch a prey.

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  15. How is ultrasound used for cleaning ?

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  16. Explain the working and application of a sonar.

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  17. Write the full name of SONAR. How will you determine the depth of a se...

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  18. Write full form of SONAR. List any two purposes for which, it is used ...

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  19. A sonar device on a submarine sends out a signal and receives an echo ...

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  20. Explain how defects in a metal block can be detected using ultrasound.

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