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3 years ago

Which kinds of objects emit light?

2 answers:

5 0

A: objects that shine
Visible: Our eyes detect visible light<span>. Fireflies, </span>light<span> bulbs, and stars all </span>emit<span> visible </span>light<span>. Ultraviolet: Ultraviolet radiation is </span>emitted<span> by the Sun and are the reason skin tans and burns. "Hot" </span>objects<span> in space </span>emit<span> UV radiation as well.</span>

Otrada [13]3 years ago

4 0

<h2>Answer:</h2>

<u>A) objects that shine </u>

<u>B) hot objects </u>

<h2>Explanation:</h2>

Actually our eyes see objects when light reflects from those objects and reach our eyes. Emission of light is only possible from source of light. The other one is reflection. So in the given options shiny objects and hot objects can become the source of light that is why we can say that shiny and hot objects emit light.

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Bogdan [553]

I believe this is true

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3 years ago

A point charge of -2 µC is located at the origin. A second point charge of 6 µC is at x = 1 m, y = 0.5 m. Find the x and y coord

Soloha48 [4]

Answer:

x coordinate = -1.66 m

y coordinate is = -0.825m

Explanation:

Suppose z be the distance form the first charge and z + sqrt(1^2 +.5^2) be the distance from the second So z + sqrt(1+.25) = z + 1.12

We have k*2.0x10^-6/s^2 = k*6x10^-6/(s+1.12)^2

0.0356s^2 -0.019s-0.0897=0

s=1.876m

The angle of the line between the two charges is arctan(.5/1) = 26.6o

x coordinate = -1.876*cos(26.6) = -1.66m

y coordinate is -1.876*sin(26.6) = -0.825m

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3 years ago

A uniform electric field, with a magnitude of 370 N/C, is directed parallel to the positive x-axis. If the electric potential at

dem82 [27]

Answer:

$\Delta U = 0.2072 J$

Explanation:

Potential difference between two points in constant electric field is given by the formula

$\Delta V = E.\Delta x$

here we know that

$E = 370 N/C$

also we know that

$\Delta x = 2.1 - 1.9 = 0.2 m$

now we have

$\Delta V = 370 (0.2) = 74 V$

now change in potential energy is given as

$\Delta U = Q\Delta V$

$\Delta U = (2.80 \times 10^{-3})(74)$

$\Delta U = 0.2072 J$

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4 years ago

Star Characteristic Questions<br> What are the two things that stars are emitting into space?

katovenus [111]

Answer:

1- Light , 2-Heat , ( and Nuclear energy)

Explanation:

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3 years ago

Tonks changes her hair color for a party with a red color rinse. The next day, she washes the color out of her hair and it retur

Sergeu [11.5K]

Answer: No , a chemical change has not occured as it was easily reversed.

Explanation:

Chemical change is defined as a change in which rearrangement of atoms take place and leads to formation of new substances. It can only be reversed with the help of a chemical reaction.

Physical change is defined as a change which leads to change in shape, size or state of the substance changes. No new substance is formed.It can be easily reversed.

As the hair colour was washed out and returned to its original brown colour, it was a physical change.

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3 years ago