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loris [4]
3 years ago
5

If an object only reflects ultraviolet photons, what color would it look to us? white a) black b)c) redclear d)violet e)

Physics
1 answer:
xenn [34]3 years ago
4 0

Answer:

The correct answer is option 'b': Black

Explanation:

As we know that the color that our eye perceives is the color of the component of the visible light that the object reflects. It means that if an object reflects wavelength of red light when white light is incident on it it will appear to be red.

in our case it is given that the object absorbs all the wavelengths of the visible light spectrum thus it will appear as black to our eye.

Now since our eyes cannot sense the ultraviolet spectrum of light thus we cannot observe any difference if the object emitted the UV radiation or not. Hence the object will appear to be black.

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What are the formulas for Work, KE, GPE and Power?
Katyanochek1 [597]

Answer:

work=f×d

GPE =m×g×h

kinetic energy =  \frac{1}{2} mv {}^{2}  \\ power =  \frac{w}{t}

6 0
3 years ago
An element consists of two isotopes. The abundance of one isotope is 60.40% and its atomic mass is 68.9257 u. The atomic mass of
amm1812

Answer:

69.7173 u

Explanation:

The abundance of the first isotope is =60.40%

So the abundance of the second isotope =100%-60.40%=39.6%

Atomic mass of first isotope = 68.9257

So the average atomic mass of the first isotope =68.9257×0.6040=41.6311 u

Atomic mass of the second isotope =70.9249 u

So average atomic mass of second isotope =70.9249×0.396=28.086

Now the average atomic mass =41.6311+28.086=69.7173 u

7 0
3 years ago
Read 2 more answers
How does the sun's energy travel to Earth?
Elena-2011 [213]

Answer: The sun’s radiation consists of small, massless packets of energy called photons. They travel seamlessly through space; whenever they strike any object, the object absorbs photons and its energy is increased, which then heats it up.

Explanation:

5 0
3 years ago
Read 2 more answers
The path of a meteor passing Earth is affected by its gravitational force and falls to Earth's surface. Another meteor of the sa
Lina20 [59]

Answer: The correct answer is option (C).

Explanation:

As it is given in the problem, the path of a meteor passing Earth is affected by its gravitational force and falls to Earth's surface. Another meteor of the same mass falls to Jupiter's surface due to its gravitational force.

According to Newton's law of universal gravitational, every particle attracts every other particles in the universe with the gravitational force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

The Jupiter is the most massive planet in the solar system. It is also the largest planet in the solar system. The gravity of Jupiter on its surface is 2.4 times that of surface gravity of the Earth.

If a person weighs 100 pounds on the Earth then he would weigh 240 pounds on Jupiter.

Therefore, the correct answer is option (C), the meteor falls to Jupiter faster due to its greater gravitational force.

8 0
3 years ago
Read 2 more answers
suppose the ball has the smallest possible frequency that allows it to go all the way around the circle. what tension in the str
tatyana61 [14]

The complete question is missing, so i have attached the complete question.

Answer:

A) FBD is attached.

B) The condition that must be satisfied is for ω_min = √(g/r)

C) The tension in the string would be zero. This is because at the smallest frequency, the only radially inward force at that point is the weight(force of gravity).

Explanation:

A) I've attached the image of the free body diagram.

B) The formula for the net force is given as;

F_net = mv²/r

We know that angular velocity;ω = v/r

Thus;

F_net = mω²r

Now, the minimum downward force is the weight and so;

mg = m(ω_min)²r

m will cancel out to give;

g = (ω_min)²r

(ω_min)² = g/r

ω_min = √(g/r)

The condition that must be satisfied is for ω_min = √(g/r)

C) The tension in the string would be zero. This is because at the smallest frequency, the only radially inward force at that point is the weight(force of gravity).

5 0
3 years ago
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