Do you know the speed of the light? How much time did light take to cover the distance of 3 m from the window to the table? Compare this with the time taken by sound of alarm clock to reach you.
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➡️speed of light is 3*10⁸m/s
➡️it take 1*10-⁸ sec to cross such distance
➡️time taken by light is negligible as compared with sound(440m/s)
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