Subject Experts Solutions for Chapter: Sound, Exercise 2: PRACTICE QUESTIONS (COMPETITION WING)

Three persons $P_1$, $P_2$, and  $P_3$ are at different points A, B, and C, respectively, as shown in the figure. Two persons $P_1$ and  $P_3$ clap at the same time. Which among the following can be the minimum distance between $P_2$ and $P_3$ to hear the clap sound distinctly? (Take the velocity of sound in air as $330 \mathrm{m} {\mathrm{s}}^{-1}$)

The audible range of frequency is $20 \mathrm{Hz}$ to $20,000 \mathrm{Hz}$. Determine the corresponding range of time periods of vibrations.

A bat entering into a well finds it difficult to come out of it. Explain the reason.

Ramu and Numu are celebrating Diwali with crackers when Ramu fired a cracker after looking at the lighting Numu started counting seconds hand movement in his watch at $8.00 \mathrm{pm}$ and he stopped counting when he heard the cracker sound at $08:00:02 \mathrm{pm}$. Find the distance between Ramu and Numu if the speed of the sound is $310 \mathrm{m} {\mathrm{s}}^{-1}$.

A student breaks a fused bulb, and then hears a sound of explosion. What could be the reason for this? Explain.

How are dogs made alert by the crime department? Explain.

Three boys Ravi, John, and Asif stand in a straight line as shown in the figure. Ravi and Asif fire crackers at the same instant of time. John hears the first sound after $2 \mathrm{s}$ and the second sound after $2.5 \mathrm{s}$. Determine the distance between Ravi and Asif. The velocity of sound in air is $330 \mathrm{m} {\mathrm{s}}^{-1}$

A child pushed his cradle for play and started learning numbers by counting the oscillations of his cradle. He counted one number per one oscillation starting from $1$, then find the number of numbers the child learned and cradle frequency of oscillations for the total time of $60$ second, if the time period of the cradle is $2.5 \mathrm{s}$.