Physics, 16.07.2019 23:30 iyanistacks50

When sound waves interfere to create standing waves, the points on the medium that move up and down with the largest amplitudes are called

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antinodes.

A standing wave is created when two waves in a medium interfere in such a way that certain points along the medium appear to stand still.

Indeed, the points at which the interference between the two waves is completely destructive show no displacement. These points are called nodes.

There are also points at which the interference between the two waves is completely constructive and these points appear to vibrate from a large positive position to a large negative position and back. These points are called antinodes.

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a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

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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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When sound waves interfere to create standing waves, the points on the medium that move up and down...

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