Which describes why people on earth can see light from the stars in the sky that are so far away? A.
Light from the stars is visible light and travels in longitudinal waves. Longitudinal waves require a medium to travel; therefore, light is reflected off particles of matter in space to be seen on the earth.

B.
Light from the stars is visible light and travels in electromagnetic waves. Electromagnetic waves require a medium to travel; therefore, light is reflected off particles of matter in space to be seen on the earth.

C.
Light from the stars is visible light and travels in electromagnetic waves. Electromagnetic waves do not require a medium to travel; therefore, light travels through the vacuum of space to be seen on the earth.

D.
Light from the stars is visible light and travels as surface to surface waves. Surface waves require a medium to travel; therefore, light travels from the surface of the star to the surface of the earth.

C.?

Answers

Answer 1

Answer: Yes, C is correct. It self explains itself as we know light travels through a vacuum ( doesn't need a medium) and light is a type of electromagnetic wave.

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99pts. I can't find isotope, pottasium-15 or k-15. Is this even possible, I have a fill-in-the-blanks worksheet with a table like example:Element Name: Nitrogen-20 Symbol: N-20 Atomic Number: 7 Atomic Mass: 20 Charge: 0 Protons: 7 Neutrons: 13 Electrons: 7I remember finding the isotope number, Nitrogen-20 by adding the Protons and Neutrons, then I get a new atomic mass. But on here Pottasium-15 is confusing! What neutrons do I add from 19 protons to get 15? Sometimes the teacher throws in impossible problems.
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If a car changes its velocity from 32 km/hr to 54 km/hr, what is its acceleration?

What is a sedimentary, igneous, and a metamorphic rock?

Answers

Answer:

Igneous rocks form when molten rock (magma or lava) cools and solidifies. Sedimentary rocks originate when particles settle out of water or air, or by precipitation of minerals from water. They accumulate in layers. Metamorphic rocks result when existing rocks are changed by heat, pressure, or reactive fluids, such as hot, mineral-laden water.

Explanation:

Why some air masses are cool, cold, warm, and hot as well as moist or dry?

Answers

Answer:

Explanation:

Often times, the property of air masses is a function of where they originate from especially with respect to latitude.

An air mass is certain amount of air with some unique set of temperature and vapor component.

Air masses differs from places to places based on where they originate.
Continental air masses are usually dry and cold because there is little to no water on a land mass.
Air masses that originates from the surface of the ocean are predominantly moist.
In polar regions, the air mass is cold.
Around the tropics, they are usually warm due to insolation here.

Answer:

very an explainfull question try again with another type of question

Explanation:

An..........reaction is the rearrangement of atoms by breaking and reforming chemical bonds

Answers

i think it is a chemical reaction but im not completely sure

a spider is crawling on a wall. first it crawls 1 meter up, then 1 meter to the left , and then 1 meter down. what is its total displacement?

Answers

Displacement means the straight distance from the start point to the
end point, no matter what route was followed along the way.

The spider ends up 1 meter to the left of where he started, so his
displacement for the trip is 1 meter.

If he returns to the place where he started, then his displacement
will be zero.

What did astronomers name the planet they discovered?

Answers

astronomers named the planet Kepler-186f

Astronomers named the planet they discovered Kepler-186f after the Kepler space telescope, which took the first picture of the planet.

Hi :) what’s the difference between conduction in metals & non-metals ? I know it’s the free electron diffusion thingy but I really don’t understand it at all. anyone able to help? Thank you!

Answers

The difference between metal and non-metal in terms of condition is explained below.

Explanation:

In metals, conduction occurs due to the aggregation of vibrations of molecules and free-electron distribution. While in non-metals, the mechanism for conduction is only atomic or molecular vibrations.
Apart from free electrons, there are phonons in metals as well as non-metals. Non-metals hold a confined amount of thermal conductivity only due to Phonons and Lattice vibrations.
Concerning atomic vibration in a solid thing (non-metals mainly), it is easier to know if one receives the fact that atoms are almost floating adjacent to one another depending on the covalent bonds between them.
When a metal is heated the electrons quickly respond to the heat and transfer it to the nearby atom or solid touching it. As non-metals don't possess free electrons, the heat transfer happens due to phonons (the excited state of the lattice structure vibrating uniformly).
In metals, this rarely plays a role as the electrons transfer most of the heat efficiently.

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