While looking out the window, you see lightning flash and then two seconds later, you hear the thunder. How far was the lightening from you

Question

Physics

Ashly Brewer

13 October, 00:25

While looking out the window, you see lightning flash and then two seconds later, you hear the thunder. How far was the lightening from you

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Answers (1)

Know the Answer?

Zaiden Terry · Answer 1

s = 686 m

Explanation:

Let,

time taken by light to reach the window = t

therefore,

time taken by sound to reach window = t + 2

speed of light = c = 3 x 10⁸ m/s

speed of sound = v = 343 m/s

Now, the distance covered by both light and sound is same. Therefore,

(s) light = (s) sound

(c) (t) = (v) (t + 2)

(3 x 10⁸) t = (343) (t + 2)

(3 x 10⁸ - 343) t = 686

t = 686/2.99 x 10⁸

t = 2.3 x 10⁻⁶ s

Now, the distance of lightning from window will be:

s = ct

s = (3 x 10⁸ m/s) (2.3 x 10⁻⁶ s)

s = 686 m