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lubasha [3.4K]
4 years ago
8

Choose the answer that explains the photoelectric effect. Metallic plates emit protons only when light of a certain minimum freq

uency shines on them. Metallic plates emit electrons when the cumulative effect of light causes electron movement. Metallic plates emit electrons only when light of a certain maximum frequency accumulates energy. Metallic plates emit electrons only when light of a certain minimum frequency shines on them.
Physics
1 answer:
Pavlova-9 [17]4 years ago
3 0

Answer:

Metallic plates emit electrons only when light of a certain minimum frequency shines on them.

Explanation:

For the photoelectric effect to take place there is a minimum amount of energy required in the impinging photon of light to be able to remove an electron according to the metal in question.

The energy of a photon is proportional to its frequency, therefore there is a minimum frequency required in the incident light to be able to emit an electron.

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a foul ball is hit into the stands at a baseball game. the ball rises to a height of 38 meters and is caught on its way down by
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The velocity of the ball when it was caught is 12.52 m/s.

<em>"Your question is not complete it seems to be missing the following, information"</em>,

find the velocity of the ball when it was caught.

The given parameters;

maximum height above the ground reached by the ball, H = 38 m

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The height traveled by the ball when it was caught is calculated as follows;

y = H - h

y = 38 - 30 = 8 m

The velocity of the ball when it was caught is calculated as;

v_f^2 = v_0 + 2gh\\\\v_f^2 = 0 + (2\times 9.8 \times 8)\\\\v_f^2 = 156.8\\\\v_f = \sqrt{156.8} \\\\v_f = 12.52 \ m/s

Thus, the velocity of the ball when it was caught is 12.52 m/s.

Learn more here: brainly.com/question/14582703

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Answer:

The momentum of an object is defined as the mass of the object times the velocity of the object, as P = m*v.

So the equipment needed would be:

Something to measure the mass of the object, like a balance.

Something to measure the speed of the object, like a doppler radar, or a simpler thing may be a cronometer, with that you can measure the amount of time that the object needs to travel a given distance, and with that you can obtain the speed of the object.

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3 years ago
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