It was a rainy day in Bangalore. Rohit was sitting besides the window when he saw a lightning. He started his stop watch. He found that after $22$ seconds of lightning its roaring was heard. Calculate the height of the clouds which caused this lightning. Given, speed of light = $3 \times 10^{8}$ $m s^{- 1}$ and speed of sound = $340 m s^{- 1}$ .

10 k m

No worries! We‘ve got your back. Try BYJU‘S free classes today!

8.5 k m

No worries! We‘ve got your back. Try BYJU‘S free classes today!

7.5 k m

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

5 k m

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C $7.5 k m$
Speed of light is too high. So you can assume there is no time delay in colliding clouds and lightning.
Since the time taken for light to travel from clouds to earth is approximately 0, we can say that lightning happened at $t = 0$ and sound reached our ears at 22 s.
Given, speed of sound $= 340 m s^{- 1}$
We know, $d i s t a n c e = s p e e d \times t i m e$
$∴$ Height of clouds $= 22 \times 340 = 7480 m \approx 7.5 k m$ .

Suggest Corrections

Similar questions

It was a rainy day in Bangalore. Rohit was sitting beside the window when he saw lightning. He started his stopwatch. He found that after $22$ seconds of lightning its roaring was heard. Calculate the height of the clouds which caused this lightning. Given, speed of light = $3 \times 10^{8}$ $m s^{- 1}$ and speed of sound = $340 m s^{- 1}$ .

It was a rainy day in Bangalore. Rohit was sitting beside the window when he saw a lightning. He started his stopwatch. He found that after 22 seconds of lightning its roaring was heard. Calculate the height of the clouds (approximately) which caused this lightning. Given,
Speed of light = $3 \times 10^{8} \frac{m}{s}$ and Speed of sound = $340 \frac{m}{s}$ .

It was a rainy day in Bangalore. Rohit was sitting beside the window when he saw a lightning. He started his stopwatch. He found that after 22 seconds of lightning its roaring was heard. Calculate the height of the clouds which caused this lightning. Given,
Speed of light = $3 x 10^{8} \frac{m}{s}$ and Speed of sound = $340 \frac{m}{s}$ .

It was a rainy day in Bangalore. Rohit was sitting besides the window when he saw a lightning. He started his stop watch. He found that after 22 seconds of lightning thunder was heard. Calculate the height of the clouds which caused this lightning. Given,
Speed of light = 3 x $10^{8}$ $\frac{m}{s}$ and Speed of sound = $340 \frac{m}{s}$ .

It was a rainy day in Bangalore. Rohit was sitting beside the window when he saw a lightning. He started his stopwatch. He found that after 22 seconds of lightning its thundering was heard. Calculate the height of the clouds which caused this lightning. Given, speed of light $= 3 \times 10^{8} m s^{- 1}$ and speed of sound $= 340 m s^{- 1}$ .

Join BYJU'S Learning Program