To fully describe the photoelectric effect, scientists must consider which of

Physics

1 answer:

erastovalidia [21]3 years ago

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Answer:

D. Light only

Explanation:

This is because photoelectric effect is a phenomenon in which electrically charged particles are emitted from a material when light is incident on it.

The light generates the energy which causes the material to emit electrons.

These electrons are only emitted at certain values of light energy, this thus shows that the light has to be quantized since electrons are not emitted over a range of values of light energy.

Thus, to fully describe the photoelectric effect, only light needs to be quantized.

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A 20-kg barrel is rolled up a 20-m ramp to the back of a truck whose floor is 5.0 m above the ground. What work is done in loadi

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The angle of inclination is calculated using sin function,

sin θ = 5 m / 20 m = 0.25

θ = 14.4775°

The net force exerted is then calculated:
F net = m g sin θ = 20 * 9.8 * 0.25

F net = 49N

Work is product of net force and distance:
W = F net * d = 49 * 20

Work = 980 J

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