Volume or intensity of a sound wave is measured by the size of the _________ and reported in decibels.
2 answers:
Answer:
Amplitude
Explanation:
The intensity (or volume) of a sound wave is proportional to the square of the sound wave:
where A is the amplitude of the wave.
The amplitude of a sound wave is measured as the maximum displacement of the wave with respect to its equilibrium position.
The intensity is measured in Decibels (dB), which is related to the logarithmic ratio between the power of two different sounds, i.e. the difference in decibels between two sounds is given by
where P1 and P2 are the power of the two sounds.
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Answer:
Explanation:
Given:
- mass of the object on a horizontal surface,
- coefficient of static friction,
- coefficient of kinetic friction,
- horizontal force on the object,
<u>Now the value of limiting frictional force offered by the contact surface tending to have a relative motion under the effect of force:</u>
where:
normal force of reaction acting on the body= weight of the body
As we know that the frictional force acting on the body is always in the opposite direction:
So, the frictional force will not be at its maximum and will be equal in magnitude to the applied external force and hence the body will not move.
so, the frictional force will be: