(7%) Problem 2: A student witnesses a flash of lightning and then t = 3.5 s late

Question

(7%) Problem 2: A student witnesses a flash of lightning and then t = 3.5 s later the student hears the associated clap of thunder Otheexpertta. 50% Part (a) Sound travels at 343 m s in the air what distance from the student is the lightning strike, in meters? 50% Part (b) Light travels at 3.0 × 10s m s m the air. How long t/ in seconds did it take the light to reach the student's eyes after the lightning strike? Deductions sinO | cos() | tand) | | ()| 7| 8|9 Late Potential cotan asin0 acosO atan0 acotanO sinhO cosho tanh0 cotanhO Submissions Attempts remaining (0% per attempt) detailed view * Degrees Radians

Explanation / Answer

distance is d then
time taken by light, t1 = d/ c

time taken by sound, t2= d/v

t2 -t1 = d (1/v - 1/c) = 3.5

( c = 3 x 10^8 m./s and v = 343 m/s )

d = 1200.5 m  

(B) t1 = (1200.5)/(3 x 10^8) = 4 x 10^-6 sec

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