Physics, 21.07.2019 03:31 victoria6929

As thunder travels away from a lightning channel, the amplitude (loudness) of the sound by as the distance from the channel doubles.

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The sentence can be completed as follows:
"As thunder travels away from a lightning channel, the amplitude (loudness) of the sound DECREASES by A FACTOR 4 as the distance from the channel doubles."

In fact, the intensity of a sound wave follows an inverse square law: it means it is inversely proportional to the square of the distance, 1/r^2

, where r is the distance from the source. We see from the formula that, if we double the distance, the intensity gets a factor 1/4

, which means that the intensity decreases by a factor 4.

Answer from: Quest

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.

Answer from: Quest

because if the tool that you are using is not balanced it there would be false mass.

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As thunder travels away from a lightning channel, the amplitude (loudness) of the sound by as the...

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