Question 6
Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?

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Solution

The speed of sound (344 m/s) is less than the speed of light $(3 \times 10^{8} m / s)$ . The sound of thunder takes more time to reach the surface of Earth as compared to light. Hence, a flash is seen before we hear a thunder.

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Speed of Sound

Standard IX Physics

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Question 6 Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?

The speed of sound (344 m/s) is less than the speed of light (3×108m/s). The sound of thunder takes more time to reach the surface of Earth as compared to light. Hence, a flash is seen before we hear a thunder.

Question 6
Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?

The speed of sound (344 m/s) is less than the speed of light $(3 \times 10^{8} m / s)$ . The sound of thunder takes more time to reach the surface of Earth as compared to light. Hence, a flash is seen before we hear a thunder.