Which of the following are properties of mechanical waves a) energy is transferred with the motion of wave b) waves begin at a source with a disturbance c) waves require a medium or material to move through d) particles of a medium always move perpendicular to the wave motion

The properties of mechanical waves is that such waves require a medium or material to move through.

Wave is a variation which helps to transfer energy from one point to another

in a medium and is divided into  mechanical waves and non-mechanical

waves.

Mechanical waves such a sound and water waves require a medium or

material to move through while non mechanical waves such as

electromagnetic waves don't require any medium.

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c) waves require a medium or material to move through

Explanation:

Waves can me characterized in two ways

1) Mechanical waves

2) Non-mechanical waves

As we know that waves is the disturbance or propagation of energy through the medium without actual movement of medium particles.

So here as per the medium requirements we can divide it into two parts

here we know that

all waves which requires medium to travel is known as mechanical waves

While all such waves which do not require any medium to travel is known as non mechanical waves.

so here we have correct answer as

c) waves require a medium or material to move through

wavelength variability is the right one