Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. This is because:

Correct comparison between light waves and sound waves is:

Sound waves travels _________ than light in vacuum.

Sound waves travels _____  light in air

The distance between tow adjacent particles which are in the same phase in a progressive wave is 20 cm. determine the velocity of the wave if its frequency is 10 Hz.

Light and Sound waves

The thunder of a cloud is heard later compared to flash of lightning because :

You see lightning before you hear the thunder because

Speed of sound wave in a gas is $v _{1}$ and tins speed of molecules of the gas at the same temperature is $v _{2}$. Then :

A source of frequency 500Hz emits waves of wavelength 0.2m.How long does it take to travel 300 m?

Sounds travels quickest in_____

A worker lives at a distance of 1.32 km from the factory. If the speed of sound in air is 330 m$s^{-1}$, how long will the sound of factory siren take to reach the worker?

A thunder tap is heared 5 second after the lightening flash. The distance of the flash is (velocity of sound in air is 345 m/sec.) :

Two waves of wavelengths $\lambda$ and $(\lambda + \triangle \lambda)$ produce $6$ beats per second. If $\dfrac {\triangle \lambda}{\lambda} = \dfrac {\lambda + \triangle \lambda}{51}$, find the speed of sound wave in a gas in which these waves produce beats?

Flash and thunder are produced simultaneously. But the thunder is heard a few seconds after the flash is seen. Why?

The speed of light in vaccum is....

The time interval between a lightning flash and the first sound of thunder was found to be $5 \ s$. If the speed of sound in air is $330  \ ms^{-1}$, find the distance of flash from the observer.

The speed of sound in a certain medium is $960 m/s$. If $3600$ waves pass over a certain point in 1 minute, the wavelength is,

When a tuning fork of 500 Hz is used, the first and second resonating lengths of closed air column are found to be 18 cm and 54 cm respectively. Find the velocity of sound in S.I. system.

An observer measures speed of light to be C when he is stationary with respect to the source. If the observer moves with velocity $\displaystyle v$ towards the source then the velocity of light observed will be :

The frequency of fundamental mode of vibration of an air column enclosed in a closed end pipe is 250 Hz. If its length is 33 cm, then find the velocity of sound in air.

A wave has a frequency of $5$ GHz.
What is the period of the wave?

Which of the following product of $e, h, \mu, G$ (where $\mu$ is the permeability) be taken so that the dimensions of the product are same as that of the speed of light?

The ratio of speed of ultrasonic wave and sound wave is:

As the train crosses a stationary observer, the apparent change in frequency of sound in the ratio $5:3$. If the velocity of sound in air $332\ m/s$, then velocity of train is

A laser signal sent towards the moon returns after T seconds.If c is the speed of light, then  the distance of the moon from the observer is given by

The speed of sound is $330 ms^{-1}$ and that of light is $3\times 10^8 ms^{-1}$. The ratio of speed of sound to that of light is approximately $1 : 10^6$.

If you hear a gun shot 1 seconds after it is fired, how far away from the gun are you? (speed of sound in air $=330 ms^{-1})$

Light .......... travel in vacuum , but the sound ........ travel in vacuum.

Speed of light in air is about ....... times greater than the speed of sound in air.

An aeroplane travelling at the speed of sound will have a velocity of:

The correct statement is:

 A stone is dropped from the top of a tower $500$m high into a pond of water at the base of the tower. When is the splash heard at the top ? (Given $g = 10 ms^{-2}$ and speed of sound =$ 340 ms^{-1}$)

If the pressure of the medium increases then the speed of sound

What is the change in frequency observed by a stationary observer when a source of frequency f; Take speed of sound in $air=V _0$

The sound of lightning flash is heard $3$ second after the flash is seen. The distance of the lightning is $1020$ metre. The speed of sound is:

The speed of sound in air is  330m/s. It takes 10s for sound to reach a certain distance from the source placed in air. Find the distance.

The smoke from a gun barrel is seen 10s before the explosion is heard. If the speed of sound in air is 340 m/s. Calculate the distance of observer from the gun :

On a hot, dry summer day a boy is standing between plane parallel vertical cliffs separated by $75m$. He is $30$m away from one of the cliffs. Consider speed of sound in air on that hot day to be $360m/s$. The boy claps loudly and hearts its successive echoes. The time in seconds at which he hears the first four echoes are respectively