Question

Sound produced by the thunderstom is heard 10 secs after the lightning is seen. Calculate the approximate distance of the thundercloud.(given speed of sound = 340m/sec)

Answer 1

$$\begin{gathered} \mathrm{Suppose}\mathrm{the}\mathrm{distance}\mathrm{of}\mathrm{the}\mathrm{thundercloud}\mathrm{is}\mathrm{d}. \\ \mathrm{At}\mathrm{t}=0, \\ \mathrm{Lightning}\mathrm{is}\mathrm{seen}\mathrm{in}\mathrm{the}\mathrm{cloud}. \\ \mathrm{Time}\mathrm{taken}\mathrm{for}\mathrm{thunder}\mathrm{to}\mathrm{be}\mathrm{heard}\mathrm{is}10\mathrm{s}. \\ \mathrm{Speed}\mathrm{of}\mathrm{sound}=\frac{\mathrm{d}}{10} \\ \mathrm{or}\mathrm{d}=340\times 10=3400\mathrm{m} \end{gathered}$$