Audible and Inaudible Sounds

The sound from an insect is produced when it vibrates its wings at an average rate of $500$ vibrations per second. Can we hear this sound? Why or why not? 

Three different vibrating objects produce three types of sounds $\mathrm{X},\mathrm{Y}$ and $\mathrm{Z}$. The sounds $\mathrm{X}$ and $\mathrm{Y}$ cannot be heard by a man having a normal range of hearing, but sound $\mathrm{Z}$ can be heard easily. The sound $\mathrm{X}$ can be heard by a bat whereas, the sound $\mathrm{Y}$ can be heard by rhinoceros. What type of sounds are $\mathrm{X},\mathrm{Y}$ and $\mathrm{Z}$.

The speeds of sound in four different media are given below. Which of the following is the most likely speed in $\mathrm{m}/\mathrm{s}$ with which the two underwater whales in a talk to each other when separated by a large distance?

Calculate the time period of a pendulum which is vibrating with a frequency of $10 \mathrm{hertz}$.

What differences will you hear in a sound if there is an increase in: frequency 

What differences will you hear in a sound if there is an increase in : amplitude

Which of the following frequency of sound can be generated by a vibrating simple pendulum as well as by the vibrating vocal cords of a rhinoceros?

What is ultrasound? State two uses of ultrasound.

The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of the sea?

The ultrasound waves can penetrate into matter to a large extent because they have

One of the following can hear infrasound. This one is -

When we change a feeble sound to a loud sound, we increase its :

Which of the following frequency of sound can be heard by a dog but not by a man?

(a) $50,000 \mathrm{hertz}$

(b) $15,000 \mathrm{hertz}$

Which of the following sound frequencies can be heard by a woman having a normal hearing range?

$\begin{array}{rcl}& & \mathrm{A}. 25000 \mathrm{Hz} \\ & & \mathrm{B}. 15 \mathrm{KHz} \\ & & \mathrm{C}. 4000 \mathrm{Hz} \\ & & \mathrm{D}. 25 \mathrm{Hz}\end{array}$

Why do we not hear the screams of a bat?

What is the name of very high frequency sounds which cannot be heard by the human ear?