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Flash of lightning reaches us earlier th...

Flash of lightning reaches us earlier than the sound of thunder. Explain the reason.

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### Step-by-Step Solution: 1. **Understanding the Phenomenon**: When a flash of lightning occurs, we see the light almost instantaneously, while the sound of thunder reaches us later. This difference in the time of arrival of light and sound is what we need to explain. 2. **Speed of Light vs. Speed of Sound**: The speed of light in air (and in a vacuum) is approximately 300,000 kilometers per second (or about 3 lakh meters per second), whereas the speed of sound in air is approximately 330 meters per second. 3. **Comparison of Speeds**: The speed of light is vastly greater than the speed of sound. This means that light can travel much faster than sound over the same distance. ...
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ICSE-PROPAGATION OF SOUND WAVES -EXERCISE -8(A)
  1. Compare approximately the speed of sound in air, water and steel

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  2. Answer the following: Can sound travel in vacuum ?

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  3. Answer the following: How does the speed of sound differ in different ...

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  4. Flash of lightning reaches us earlier than the sound of thunder. Expla...

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  5. If you place your ear close to an iron railing which is tapped some di...

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  6. The sound of an explosion on the surface of a lake is heard by a boat ...

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  7. How do the following factors affect, if at all, the speed of sound in ...

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  8. How do the following factors affect, if at all, the speed of sound in ...

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  9. How do the following factors affect, if at all, the speed of sound in ...

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  10. How do the following factors affect, if at all, the speed of sound in ...

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  11. How does the speed of sound change with change in amplitude .

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  12. How does the speed of sound change with change in wavelength of sound ...

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  13. In which medium the speed of sound is more : humid air or dry air ? Gi...

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  14. How does the speed of sound in air vary with temperature ?

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  15. Describe a simple experiment to determine the speed of sound in air. W...

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  16. Complete the following sentence : Sound can not travel through .......

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  17. Complete the following sentence : When sound travels in a medium, t...

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  18. Complete the following sentence : A longitudinal wave is composed o...

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  19. Complete the following sentence : A transverse wave is composed of ...

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  20. Complete the following sentence : Wave velocity = …………….. xx wavele...

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