(4.) The magnitude of the vector sum of two vectors a and b is 8u, and magnitude of b is 5u. If the direction of a is reversed, the magnitude of the vector sum becomes 10u. Find the angle between a and b

Although light from the sun appears white, it is actually made up of a lot of different colors. this portion of the electromagnetic spectrum, we call white light is referred to as within the electromagnetic spectrum.

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

Gas cloud 1 is likely to form a star. gas cloud 2 is not. based on this information, match the given conditions with each cloud