Sound produced by a thunderstorm is heard $10 \, s$ after the lightning is seen. Calculate the approximate distance of the thunder cloud. (Given speed of sound $= 340 \, m \, s^{-1}$.) (in $, m$)

Define the following characteristics of sound:
$(a)$
$(i)$ Pitch
$(ii)$ Loudness
$(iii)$ Quality or Timbre
$(b)$ $A$ boy receives his echo $3 \, s$ later. Find the distance of the reflecting surface from the boy. Speed of sound in air is $342 \, m s^{-1}$.

What change,if any,would you expect in the characteristics of musical sound when we increase $(i)$ its frequency and (ii) its amplitude?

Why are the ceiling and the wall behind the stage of good conference halls or concert halls made curved?

State whether the following statement is true or false: The velocity of sound in air is higher for higher frequencies than for lower frequencies.

Establish the relationship between the speed of sound, its wavelength, and frequency. If the velocity of sound in air is $340 \, m \, s^{-1}$, calculate:
$(i)$ The wavelength when the frequency is $256 \, Hz$.
$(ii)$ The frequency when the wavelength is $0.85 \, m$.