A thunder clap is heard 5.5 s later than the lightning flash. The distance of the flash is: Speed of sound in air is 330 m s¯¹]
The correct answer is (b) 1815 m. The distance is calculated using distance = speed × time. Given the speed of sound as 330 m/s and time as 5.5 s, the distance is 330 × 5.5 = 1815 m.
Class 9th Science NCERT MCQ Questions
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(b) Speed of sound in air v = 330 m s⁻¹
Time gap between lightening and thunder clap t = 5.5 s
∴ Distance of flash s = vt = 330 x 5.5 = 1815 m
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