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Consider the wave equation y=10sin⁡(7(x−50t))y =10\sin(7(x-50t)). What does the number 10 in the equation represent?

a.

Acceleration

b.

Speed

c.

Amplitude

d.

Wavelength

Cathode rays are

a.

High energy electromagnetic waves

b.

Protons

c.

Neutrons

d.

Streams electrons

In a discharge tube, most of the gas is pumped out so that electricity is conducted at

a.

Steady voltage.

b.

High pressure

c.

Low pressure

d.

Low voltage

Which of the following electromagnetic waves is most energetic?

a.

Radio waves

b.

X-ray

c.

Gamma rays

d.

Ultra-violet rays

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