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Frequency = 8 Hz ; Period = 0.125 s

Step-by-step explanation:

The amplitude of a wave is simply regarded as the maximum displacement experienced by a vibrating both from its equlibrum position.

The Displacement marked A in th picture is tbe Amplitude of the wave

The wavelength refers to the a complete cycle moved by a wave, that is the distance from a crest to another (maximum upward Displacement) or a trough to another (maximum downward Displacement).

2.)

Given that :

Velocity (V) of wave = 20 m/s

Wavelength (λ) = 2.5 m

The frequency (f) of the wave ;

f = v /λ

f = (20 m/s) ÷ 2.5m

f = 8 Hz

The period T of the wave :

T = 1 /f

T = 1 / 8

T = 0.125 seconds

15 units use socratic

step-by-step explanation: 15 units

the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

step-by-step explanation: