Physics, 14.04.2020 22:10, shashayantie6556

In an experiment to illustrate the propagation of sound through fluids, identical sound sources emitting at 440 Hz are used to propagate sound waves through mercury and through ethanol.

Medium Sound Speed
Ethanol 1,160 m/s
Mercury 1,450 m/s

Which of the following statements is correct, assuming that the dampening effect in each medium is negligible?

A. In ethanol, the frequency of the wave is greater to compensate for the smaller wavelength
B. In mercury, the frequency of the wave is the same as in ethanol, but the wavelength is greater.
C. In ethanol and mercury, the wavelength of the wave is the same, even if the speed of sound is different.

Answers: 3

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Answers

answered: desdes1499

B. In mercury, the frequency of the wave is the same as in ethanol, but the wavelength is greater.

Explanation:

To solve this easily, we can just calculate the wavelength of the sound in Ethanol and in Mercury.

In Ethanol, the wavelength will be:

λ = c/f

λ = 1160/440

λ = 2.63 m

In Mercury, the wavelength will be:

λ = c/f

λ = 1450/440

λ = 3.3 m

The wavelength of sound is greater in Mercury than in Ethanol but the frequency is the same.

Frequency of sound is not dependent on medium, but velocity and wavelength change depending on the medium.

answered: Guest

answer is c

explanation:

answered: Guest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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In an experiment to illustrate the propagation of sound through fluids, identical sound sources emit...