Atransverse wave on a string has an amplitude a. a tiny spot on the string is colored red. as one cycle of the wave passes by, what is the total distance traveled by the red spot?

a.) 4a
b.) 1/2 a
c.) 1/4 a
d.) a
e.) 2a

E. 2A

Explanation:

Amplitude(A) of a wave is the displacement of a body from its position of rest. The maximum value of the amplitude is the crest and the minimum value is the trough.

For a wave to make a cycle, it has to move to and from from its point of displacement.

If the red spot on the string completes a cycle, this means it must have pass through the crest and the trough making it 2 amplitudes.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia