Physics

If a particle is travelling with a speed of 0.9 of the speed of sound and is emitting radiations of frequency 1 kHz and moving towards the observer, what is its apparent frequency (in kHz) ? If a particle is travelling with a speed of 0.9 of the speed of sound and is emitting radiations [...]

λ1 = 100 cm, λ2 = 90 cm and velocity of sound = 396 m/s. The number beats (in Hz) are λ1 = 100 cm λ2 = 90 cm and velocity of sound = 396 m/s. The number beats (in Hz) are November 5, 2020 Category: Arihant Physics by D.C Pandey , Chapter 16 - [...]

Two identical stringed instruments have frequency 100 Hz. If tension in one of them is increased by 4% and they are sounded together, then number of beats in one second is : then number of beats in one second is : Two identical stringed instruments have frequency 100 Hz. If tension in one of them [...]

In a mixture of gases, the average number of degrees of freedom per molecule is 6. The rms speed of the molecules of the gas is c. The velocity of sound in the gas is In a mixture of gases the average number of degrees of freedom per molecule is 6. The rms speed of [...]

The intensity level of sound wave is said to be 4 decibel. If the intensity of wave is doubled, then the intensity level of sound, as expressed in decibel would be as expressed in decibel would be The intensity level of sound wave is said to be 4 decibel. If the intensity of wave is [...]

A person speaking normally produces a sound intensity of 40 dB at a distance of 1 m. If the threshold intensity for reasonable audibility is 20 dB, the maximum distance at which he can be heard clearly is. A person speaking normally produces a sound intensity of 40 dB at a distance of 1 m. [...]

The frequency of a sound wave is n and its velocity is v . If the frequency is increased to 4n, the velocity of the wave will be The frequency of a sound wave is n and its velocity is v . If the frequency is increased to 4n the velocity of the wave will [...]

When the temperature of an ideal gas is increased by 600 K, the velocity of the sound in the gas becomes root3 ​times the initial velocity in it . The initial temperature of the gas is at 300 K is? The ratio of the speed of sound in nitrogen gas to that in helium gas [...]

In a medium sound travels 2 km in 3 sec and in air, it travel 3 km in 10 sec . The ratio of the wavelengths of sound in the two media is In a medium sound travels 2 km in 3 sec and in air it travel 3 km in 10 sec . The [...]

The ratio of the speed of sound in nitrogen gas to that in helium gas, at 300 K is? at 300 K is? The ratio of the speed of sound in nitrogen gas to that in helium gas November 5, 2020 Category: Arihant Physics by D.C Pandey , Chapter 16 - Waves , Volume 1 [...]