# Physics Past Questions | JAMB, WAEC, NECO and Post UTME Past Questions

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### Question 4761

A boy receives the echo of his clap reflected by a nearby hill 0.8s later. If the speed of sound in air is 3.40ms$$^-1$$, how far is he from the hill?

A) 66m

B) 136m

C) 264m

D) 528m

### Question 4762

The critical angle for light travelling from a transparent medium to air s measured as 340. The refractive index of the medium is

A) 0.56

B) 1.50

C) 1.79

D) 2.02