In sport meet the timing of a 200 m straight dash is recorded at the finish point by starting an accurate stop watch on hearing the sound of starting gun firen at the starting poing. The time recorded will be more accurate

Options

A. In winter
B. in summer
C. in all seasons
D. none of these

Answer

B

Explanation

Time recorded in summer is more accurate. The velocity of sound is directly proportional to the squre root of absolute temperature. Hence, the sound of the gun fired at the starting point will reach the finishing point quicker in summer than in winter. The lapse of time due to the time taken by the sound in reaching the finish point will be less in summer and hence the time recorded will be more accurate in summer than in winter.