When does light refract?

when it travels through gases

when it crosses the boundary between two types of material

Light refracts every 2000 wavelengths.

when it travels through a vacuum

A straight, horizontal length of copper wire has a current i=28A through it. What are the magnitude and direction of the minimum magnetic field B needed to suspend the wire (to balance the gravitational force on it) if the linear density of the wire

a spring stretches by 0.12 m when some apples weighing 3.2 N are supported from it. What is the Spring Constant?

Which of the following statements about nuclear energy is true? a. Nuclear energy cannot be contained nor controlled. b. Nuclear energy is contained in nuclear bonds. c. Nuclear energy is less efficient than other energy forms. d.

Which of the following describes the importance of cyanobacteria to early Earth atmosphere formation? A.) Cyanobacteria released oxygen into the air, creating a protective ozone layer B.

How do you give an example for finding net force?

An object's inertia causes it to come to a rest position. True or false

Nine-year-old Dakoda realizes that the quantity of water in a glass remains the same, even when the water is poured into a different shaped glass and appears to look like more or less.

How does under water welding work?

If two waves are traveling at the same speed, which statement will be true about their wavelengths? A. The wave with higher frequency will have shorter wavelength. B. The wave with lower frequency will have shorter wavelength. C.

The heating of the lower layer of the atmosphere from radiation absorbed by certain heat - absorbing gasses is called?