Two closed pipes produce 10 beats per second when emitting their fundamental nodes. If their lengths are in the ratio of 25:26, then their fundamental frequencies in Hz are
Options
(a) 270280 (b) […]
A vibrating string of certain length l under a tension T resonates with a mode corresponding to the first overtone (third harmonic) of an air column of length 75 cm inside a tube closed at […]
A string is stretched between fixed points seperated by 75 cm. It is observed to have resonant frequencies of 420 Hz and 315 Hz. There are no other resonant frequencies between these two. Then, the […]
A sound absorber attenuates the sound level by 20 dB. The intensity decreases by a factor of
Options
(a) 100 (b) 1000 (c) 10000 (d) 10
Correct Answer:
100
Explanation:
L₁ = 10 […]
If wavelength of a wave is λ=6000 Å, then wave number will be
Options
(a) 166×10³ m⁻¹ (b) 16.6×10⁻¹ m⁻¹ (c) 1.66×10⁶ m⁻¹ (d) 1.66×10⁷ m⁻¹
Correct Answer:
1.66×10⁶ m⁻¹
Explanation:
No explanation […]
A bus is moving with a velocity of 5 ms⁻¹ towards a huge wall. The driver sounds a horn of frequency 165 Hz. If the speed of sound in air is 335 ms⁻¹, the numebr […]
An engine is moving towards a wall with a velocity 50 ms⁻¹ emits a note of 1.2 kHz. Speed of sound in air=350 ms⁻¹. The frequency of the note after reflection from the wall as […]
When sound is produced in an aeroplane with a velocity of 200 m/s horizontally, its echo is heard after 10√5 seconds. If velocity of sound in air is 300 ms⁻¹ the elevation of aircraft is […]
In the experiment for determination of velocity of sound in air, using the resonance column method, the length of the air column that resonates in the fundamental mode with a tuning fork is 0.1 m. […]
A uniform rope of length 12 m and mass 6 kg hangs vertically from a rigid support. A block of masses 2 kg is attached to the free end of the rope. A transverst pulse […]
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