Sound Waves

The pitch of a sound wave depends upon which one of its following characteristics?

Bose speaker produces a sound during the concert which has $120$ crests and $120$ troughs in $0.6$ seconds. What is the frequency of the wave$?$

A point source '$\mathrm{P}$' of sound is placed at origin $\left(0,0,0\right)$ in a non-isotropic medium. The wavefronts of sound emanating from' ' $\mathrm{P}$ were found to be ellipsoidal in nature. The shape of one such wave front in $\mathrm{xy}$ plane $4{\mathrm{x}}^2+{\mathrm{y}}^2=4$. A detector of small area is placed at point $\left(0.6,0.4\right)$. The rays of sound fall normally on detector. It detects the sound rays falling on it to be coming along a direction which makes an angle ${\tan }^{-1}\left(\frac{\mathrm{a}}{\mathrm{b}}\right)$ with $\mathrm{x}$ axis, where $\mathrm{a},\mathrm{b}$ are positive co-primes. Find the value of $\mathrm{a}+\mathrm{b}$?

The frequency of a wave is 5 Hz. It refers to (type of wave)

Wavelength of sound wave ranges from $1.65 \mathrm{cm}$ to $1.65 \mathrm{m}$ and wavelength of light wave ranges from $4\times {10}^{-7} \mathrm{m}$ to $7\times {10}^{-7} \mathrm{m}$.

Sound waves are longitudinal waves and light waves are transverse waves.

Medium is required for the propagation of sound whereas medium is not required for the propagation of light.

Sound waves travel in air with a speed of $3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}$ and light waves travel in air with a speed of about $340 \mathrm{m} {\mathrm{s}}^{-1}$.

Both the light waves and sound waves can travel through a vacuum.

Light can travel in vacuum but not sound, because
 

Write any two differences between Light waves and Sound waves.

The initial value of cosine pulse wave is _____.

A _____ source can produce sound.

(Choose from: rotating/vibrating)

A person who is sitting at a distance of $400 \mathrm{m}$ from a source of sound is listening to a sound of $500 \mathrm{Hz}$. Find the time period (in seconds) between successive compressions from the source.

The velocity of the sound in a gas is directly proportional to the square root of its _____.

Sound requires a _____ to travel.

The velocity of sound increases with an increase in the temperature of the gas.

The velocity of sound is the least in a gaseous medium.

The velocity of sound is higher in gases than liquids.

The velocity of sound is independent of temperature.