Question.
Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. Why ?
Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. Why ?
Solution:
The speed of light is $3 \times 10^{8} \mathrm{~ms}^{-1}$ and the speed of sound is $344 \mathrm{~ms}^{-1}$ in air. That is, the speed of light is very large as compared to the speed of sound. Thus, flash of lightning is seen at first, but sound takes a little bit more time to reach our ears.
The speed of light is $3 \times 10^{8} \mathrm{~ms}^{-1}$ and the speed of sound is $344 \mathrm{~ms}^{-1}$ in air. That is, the speed of light is very large as compared to the speed of sound. Thus, flash of lightning is seen at first, but sound takes a little bit more time to reach our ears.
Click here to get exam-ready with eSaral
For making your preparation journey smoother of JEE, NEET and Class 8 to 10, grab our app now.