Newton's formula for speed of sound was modified, since

the units specifying speed of sound was incorrect

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the calculated wave speed was much less than experimentally found

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the calculated wave speed was much higher than experimentally found

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the formula can be applied only for certain wavelengths

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Solution

The correct option is B the calculated wave speed was much less than experimentally found
The calculated speed of sound using Newton's law of motion was 278.4 m/s, while the actual value was 331 m/s. A discrepancy of 50 m/s was noted and hence this formula was modified using Laplace
The correct option is (b)

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Similar questions

Q. The speed of highly penetrating ultrasonic waves is :
(a) lower than those of audible sound waves
(b) higher than those of audible sound waves
(c) much higher than those of audible sound waves
(d) same as those of audible sound waves

Could you please tell me why the speed of sound is more in hydrogen than in the air we breathe? It was written in my textbook that the speed of sound is much greater in hydrogen than in air. (Hydrogen: 1270m/s & Air: 330 m/s).

Dual nature of matter was proposed by de Broglie in 1923, it was experimentally verified by Davisson and Germer by diffraction experiment. Wave character of matter has significance only for microscopic particles. de Broglie wavelength or wavelength of matter wave can be calculated using the following relation:

λ = \frac{h}{m v}

where, '

m

' and '

v

' are the mass and velocity of the particle. de Broglie hypothesis suggested that electron waves were being diffracted by the target, much as

X

-rays are diffracted by planes of atoms in the crystals.

Planck's constant has same dimension as that of:

λ = \frac{h}{m v}

where, '

m

' and '

v

' are the mass and velocity of the particle. de Broglie hypothesis suggested that electron waves were being diffracted by the target, much as

X

-rays are diffracted by planes of atoms in the crystals.

De-Broglie equation is obtained by combination of which of the following theories?

Sound travels at a speed which is much less than the speed of light.

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