Choose the answer that explains the photoelectric effect.

Answers

Answer 1

Answer: Photoelectric effects occurs in metals. When light or electromagnetic radiation shines upon these metals, electrons jump or are emitted freely. These emitted electrons are therefore called photoelectrons. This phenomenon can be measured in electric currents. Photoelectric effect also denotes the wave-like property of light.

Answer 2

Answer:

Answer:

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

Explanation:

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You and your friends decide that it would be fun to push a rusty old mining cart down a track. If you push it at 3.1 m/s and friction causes it to accelerate at -0.3 m/s², how long will it roll before it stops?
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You put the wet leaves in the container and turn the crank to spin off the water. The radius of the container is 13.2 cm. When the cylinder is rotating at 1.63 revolutions per second, what is the magnitude of the centripetal acceleration at the outer wall?
What letter would be a likely place for mystery element

What is the minimum current rating of the motor disconnecting means for a 40-horsepower, 208-volt, 3-phase squirrel-cage motor?

Answers

Answer:

The minimum current rating of the motor disconnecting means is 165 Amperes.

Explanation:

First convert the given power into units of watt. Since,

1 horsepower = 746 watts

Therefore,

40 horsepower = 40 x 746 watts

40 horsepower = 29840 watts

Since, we know that:

Power = Full Load Current (FLC) x Voltage

FLC = Power/Voltage

FLC = 29840 watts/208 volts

FLC = 143.46 Amperes

Now, the current for disconnecting means is at least 115% of the FLC, for the motors rated at 600 Volts or less.

Current for Disconnecting Means = (1.15)(143.46 A)

Current for Disconnecting Means = 165 Amperes

Modern scientists say that electrons are found in a ...a. cloud
b. orbital
c. pudding
d. orb

Answers

B) orbital

Each electron has at most 2 orbitals with s,d and more.

Brainliest?

I think it might be a or d i hope i have helped :)

Which piece of evidence did Alfred Wegener use to develop the theory of continental drift?A.tectonic activity concentrated in certain areas

B.the shape of the continents

C.paleomagnetism of the seafloor

D.deep-sea mountain ranges

Answers

The right answer for the question that is being asked and shown above is that: "A.tectonic activity concentrated in certain areas." A piece of evidence did Alfred Wegener use to develop the theory of continental drift is that A.tectonic activity concentrated in certain areas

A brass washer has an outside diameter of 4.50 cm with a hole of diameter 1.25 cm and is 1.50 mm thick. The density of brass is 8599 kg/m3. If you put this washer on a laboratory balance, what will it "weigh" in grams?

Answers

We will find the mass from
mass = density x volume
We are told the density and must find the volume from the dimensions given
the volume of the washer will be the area x thickness (remembering to convert all measurements to meters)
if the washer had no hole, its area would be pi (0.0225m)^2 (remember to convert to meters and to use radius)
the area of the hole is pi(0.00625m)^2
so the area of the washer is pi[(0.0225m)^2 - (0.00625m)^2] = 1.5x10^-3 m
the volume of the washer is 1.5x10^-3 m x 1.5x10^-3 m = 2.25x10^-6 m^3 (the thickness of the washer is 1.5 mm = 1.5x10^-3m)
thus, the mass of the washer = 8598kg/m^3 x 2.25x10^-6m^3 = 0.0189kg = 18.9 grams

Julie finds a snail on the sidewalk and wants to know whether or not the snail moves throughout the day. She places a single mark on the sidewalk next to the snail.What will Julie use the mark for initially?

Answers

To make a base line mark to know where she started measuring the snails movement, at the end of the day she can measure from her first line to her last to see how far the snail went.
Hope this helped!

Answer:

To check the movement of the snail.

Explanation:

the answer was right :)

Genes are unable to determine a person's A. Eye color
B. Athletic ability
C. Number of teeth
D. Shape of earlobes

Answers

Genes determine the physical traits and functions of the organism. But some characteristics are influenced by the environment. Option B, Athletic ability.

What are genes?

Genes are the hereditable DNA fragments that transmit the information needed to specify traits. This information passes from parents to offspring, generation to generation.

Genes are physically placed and arranged in the chromosomes. Each chromosome contains too many genes that might vary in length.

Geneslength depends on the pairs of bases composing them. These sequences vary in number, producing genes of different lengths.

Genes code for proteins. Proteins create the organism tissues and perform or carry out specific functions in the organisms, controlling almost all processes and chemical reactions.

According to this information, we can assume that genes are involved in determining the person's Eye color, Number of teeth, and Shape of earlobes.

Athletic ability is also influenced by the environment. Genes might be involved in the physical traits that lead a person to be athletic or not (such as muscles or strength). But the enviroment plays a significant role in determing if the person has the athletic ability or not.

Option B. Athletic ability

You can learn more about genes at

brainly.com/question/8832859

brainly.com/question/12214750

All of them are correct. If there is no all of the above choice, I would choose A.

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