Chapter 16 – Waves

The frequency of a whistle is 300 Hz. It is approaching towards a stationary observer with a speed 1/3 of the speed of sound. The frequency of sound as heard by the observer will be The frequency of a whistle is 300 Hz. It is approaching towards a stationary observer with a speed 1/3 of [...]

Two sound waves of wavelengths 1 m and 1.01 m produce 10 beats in 3 seconds. Then, the velocity of the sound in gas is the velocity of the sound in gas is Two sound waves of wavelengths 1 m and 1.01 m produce 10 beats in 3 seconds. Then November 5, 2020 Category: Arihant [...]

A locomotive engine approaches a railway station and whistles at a frequency of 400 Hz. A stationary observer on the platform observes a change of 40 Hz as the engine passes across him. If the velocity if sound is 340 m/s, the speed of the engine is If a particle is travelling with a speed [...]

Following two wave trains are approaching each other. y1 = a sin 2000 π t y2 = a sin 2008 π t The number of beats heard per second is : Following two wave trains are approaching each other. y1 = a sin 2000 π t y2 = a sin 2008 π t The number [...]

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. [...]