The ratio of speed of sound in Hydrogen to that in Oxygen at the same temperature is
- $ 1 : 4 $
- $ 4 : 1 $
- $1 : 1 $
- $ 16 :1$
The Correct Option is B
Solution and Explanation
$ v = \sqrt{\frac{\gamma P}{\rho}}$
For given temperature, $P_{H_2} = P_{O_2}$
Aslo , $ \gamma_{H_2} = \gamma_{O_2}$
$\rho = \frac{m}{V}$
$ \therefore \, \, \upsilon \propto \frac{1}{\sqrt{\rho}} \propto \frac{1}{\sqrt{m}}$
or $\frac{ \upsilon_{H_{21}}}{\upsilon_{O_2}} = \sqrt{\frac{m_{O_2}}{m_{H_2}}} = \sqrt{\frac{32}{2}} = \frac{4}{1} $
Top Questions on sound
Consider the following statements:
(i) Sound pressure changes with distance from the source
(ii) Sound power is a property of the source
(iii) Sound intensity is sound power per unit volume
Choose the correct option from the following:
- The fundamental frequency of a closed organ pipe of length \( 20 \, \mathrm{cm} \) is equal to the second overtone of an organ pipe open at both ends. What is the length of the organ pipe open at both ends?
- A point source is placed at origin. Its intensity at distance of 2 cm from source is I then intensity at distance 4 cm from the source shall be.
- The ratio of the speed of sound in hydrogen gas to the speed of sound in oxygen gas at the same temperature is:
- Which of the following is a transducer ?
(A) Loudspeaker
(B) Amplifier
(C) Rectifier
(D) Microphone
Choose the correct answer from the options given below :
Questions Asked in COMEDK UGET exam
A solid cylinder of mass 2 kg and radius 0.2 m is rotating about its own axis without friction with angular velocity 5 rad/s. A particle of mass 1 kg moving with a velocity of 5 m/s strikes the cylinder and sticks to it as shown in figure.
The angular velocity of the system after the particle sticks to it will be:- COMEDK UGET - 2024
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- In a given semiconductor, the ratio of the number density of electron to number density of hole is 2 : 1. If $ \frac{1}{7} $th of the total current is due to the hole and the remaining is due to the electrons, the ratio of the drift velocity of holes to the drift velocity of electrons is :
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- A transformer which steps down 330 V to 33 V is to operate a device having impedance 110 $\Omega$. The current drawn by the primary coil of the transformer is:
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- In the Young's double slit experiment, the 2nd bright fringe for red light coincides with the 3rd bright fringe for violet light. Then the value of 'n' is: (Given: wavelength of red light = 6300 $\text{Å}$ and wavelength of violet light = 4200 $\text{Å}$)
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- Youngs double slit experiment
- If 216 drops of the same size are charged at 200 V each and they combine to form a bigger drop, the potential of the bigger drop will be
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- Electrostatics
Concepts Used:
Sound
Sound is a vibration that propagates the mechanical wave of displacement and pressure, through a medium can be of any matter. In other words, the sound is the thin line between Music sound and Noise.
Types of Sounds:
Sound can be divided into two types depending on its frequency. The following are:-
Infrasonic Waves:
- Infrasonic waves have a frequency lower than 20 Hz. Since it is below the human hearing range, it is inaudible to humans.
- However, several other living organisms use these waves to communicate, whales, sharks, elephants, hippopotamus, etc. these waves are also used in the scientific field, it is used to study upcoming earthquakes, volcanic eruptions, human heart rates, rock formation stages, etc.
Ultrasonic waves:
- Ultrasonic waves have a frequency higher than 20 kHz. Since it is above the human hearing range, it is inaudible to humans.
- These waves are used in the scientific field, it is used to study human heart rates, to take sonograms, navigation of directions, imaging things, uniform sample mixing, communication, testing of samples, etc.