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Is the sun the only light source in the universe?
No, the Sun is not the only light source in the univrse. Every star is it's own light source, just as the sun is, but due to there distance they are not very effective. The Moon also creates a light source, because it reflects the light from the Sun back to earth. In the same way, if we where on the Moon, the Earth would be a light source, reflecting the light from the Sun at the moon.
How are light rays coming from a point source of light different then larger source?
From a point source, the light spreads out in all directions and adjacent light waves diverge from one another. From a larger source, it appears more like the light waves are moving parallel to each other, with little divergence. It's a relative thing. From the perspective of Earth, the Sun's rays are all parallel to each other because the Sun is huge and also because we are so far away from it. So the key differences are: 1. Small, point like source. 2. Being close to the source. Combinations of 1 and 2 above produce more divergent rays. Either of 1 and 2 below (or a combination of the two) will produce more parallel rays that don't diverge much. 1. Large light source 2. You're far away from the source.
What is the difference between a light source and a reflector provide examples for each?
A light source generates and emits its own light. A reflector reflects light (i.e. light bounces off of it) from another source. Examples of light sources: The sun, the stars, a lightbulb, a flame, a red-hot piece of metal. Examples of reflectors: The moon, the planets, the ground lit by the sun.
Is there two shadows if there are two light source?
Depends on the position of the light source. If the light source is in a straight line, there will be 2 shadows, one is the object and the second will be the first light souce, if lets say the object is place in the center, and one light source is place in the north direction and one in the south, there will be 2 shadow at diffrent location.
Why shadows from one source of light not parallel?
If two people are standing next to each other, and illuminated by a light source, think of this as a triangle. Imagine a line from the light source to person A, and then continuing on. This person will block some of the light and that is the shadow that is cast (along this straight line). Imagine a line from the light source to Person B, and continue that on. This person's shadow will be cast along the line from the light source to him, and continuing on. Since the two lines intersect at the light source, then they are not parallel lines. The farther away the light source is from the two people (relative to their distance from each other) the angle between the lines will decrease, so that they may seem to be almost parallel at some point. The Sun is essentially far enough away that you'd have a difficult time seeing the difference.
Can two moons reflect off each other?
Yes. Any two surfaces that reflects light can reflect off each other. They must have a light source though like a sun.
How earth rotation causes day and night?
The earth orbits around the sun and if it didn't rotate as it does so we would have one day and one night per year, each lasting 6 months. The fact that the earth rotates once every 24 hours constantly presents a changing face to the sun, which is our source of light.
How does the colors of individual lines of the spectrum of each element relate to the color of the light source as viewed with the naked eye?
The colors of individual lines in the spectrum of an element relate to the specific wavelengths of light emitted or absorbed by that element. When viewed with the naked eye, the overall color of the light source is a combination of all the wavelengths present in the source. By analyzing the spectrum of the light source, you can identify the individual colors contributing to the overall hue.
What does every other star in the Milky Way galaxy have in common with your Sun?
They are each a source of light like the Sun.
What does every other star in the Milky Way galaxy have in common with our Sun?
They are each a source of light like the Sun.
What determines the color of the northern light?
The kinds of particles that bump into each other in the Earth's atmosphere
Which has more photons a bright red light or a dim blue light?
A bright red light would have more photons compared to a dim blue light. The brightness of a light source is related to the number of photons emitted per unit time, so a brighter light source will have more photons.
