Why do you hear sound produced by the humming bees while the sound of vibrations of pendulum is not heard?

Answer 1

Generally, no sound is heard when a "simple pendulum" oscillates because of what is happening. It's just moving through the air. In a clock the sound of the "ticking" is the sound of the escapement operating. The pendulum itself makes only "air noise" as it moves back and forth. The pendulum is so small and moves in such a limited way that even if the mechanism was not encased or otherwise screened, it is imporbable that it could be heard moving through the air. In the case of a Foucault pendulum, particularly one of the big ones found in a museum or other display, the weight (called a "bob") on the end of (usually) a cable is massive (to increase the effect of the display - plus, it makes it more "fun" to see a huge weight in motion), and it can be heard moving through the air by a determined listener (if conditions are favorable). Use the link to the article on the Foucault pendulum posted by our friends at Wikipedia.

Answer 2

this is because humans have a specific range of hearing that is 2ohz to 20000hz, sound having a lower frequency than 20hz is not audible. The frequency of the vibration of the wings of a bee is much higher than the oscillations of a pendulum that's why we r not able to hear the sound of a pendulum.

Answer 3

Answer:

A sound wave is a travelling pressure fluctuation that propagates through any

medium that is elastic enough to allow molecules to gather together and move

apart. The energy of a sound wave depends on the force that is creating it. The

greater the energy in the sound wave, the bigger the RMS (root-mean-squared)

pressure fluctuation in the medium through which the sound is being conducted.

Generally speaking, sounds are perceived as being louder as the RMS sound

pressure level increases.

However, the perception of sound in any living organism is limited to a certain

range of frequencies. Sound that is perceptible by humans has frequencies from

about 20 Hz to 20 kHz, as long as the sound pressure level is high enough to allow

the ear to detect it.

For a relatively small angle of swing, the plot of a pendulum's displacement (extent

of travel from point of equilibrium) with respect to time will produce a sinusoidal

curve, representing a simple harmonic motion. Pure tones are experienced when

the eardrum moves in simple harmonic motion. In the case of the longitudinally

oscillating waves of pressure travelling through air (as from a rigid, vibrating or

oscillating source), their audibility is dependent on their frequency and on the

sound pressure being generated.

The absolute threshold of hearing (ATH) is the minimum sound level of a pure tone

that an average ear with normal hearing can detect with no other sound present.

The threshold of hearing is generally reported as an RMS sound pressure of 20 µPa

(micropascals) = 2×10-5 pascal (Pa). It is approximately the quietest sound that a

young human with undamaged hearing can detect at 1,000 Hz.

As implied above, the threshold of hearing is also frequency dependent and it has

been shown that the ear's sensitivity is best at frequencies between 1 kHz and 5

kHz. A sound with frequency less than 20 Hz falls outside of the normal range of

audibility.

The shorter the pendulum, the higher is its frequency of swing. However, even if it

is quite short, a simple pendulum only swings at a very low frequency. A pendulum of length 1 m swings at 0.5 Hz; one as short as 5 mm still only swings at 7 Hz. (At this rate the amount of energy dissipated in the air pressure oscillations would also

be very small.)

That is why the air waves due to the motion of the pendulum are not audible.

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Cliff's Notes Version:

Because a typical human can't hear sound waves at frequencies below roughly 20 Hz,

and no pendulum ever swings as fast as 20 times per second.

Answer 4

The buzzing sound of a bee is generated by the movement of its wings, which displaces air and creates sound waves that can be heard. In contrast, the vibrations of a pendulum are typically at a frequency too low for the human ear to detect or perceive as sound. The sound produced by the pendulum's vibrations is generally too faint and low in pitch to be audible.

Answer 5

It produces a sound but we are not able to hear it.

Answer 6

A vibrating simple pendulum does not produce any sound because it oscillates at very low frequencies.