What causes the appearance of lines in a emission spectrum

A light wave with a wavelength of 612nm in a vacuum travels through a bit of fused quartz which has an index of refraction of n=1.458. Find the speed of light in the quartz.

Bernice draws an oxygen atom. She draws a small circle for the nucleus. Inside of the circle, she draws plus signs for protons and dots for neutrons. Around the nucleus she uses minus signs to represent electrons.

How much energy does a 100-W light bulb use in 10 s? A) 10 J B) 100 J C) 1000 J D) 10 000 J

Why are New Hampshire students required to learn about earths systems

Is average speed a scalar or vector quantity? why?

The slope of a velocity versus time graph gives

Which of the following describes subatomic particles? carbon and nitrogen solids, liquids, gases larger than atoms protons, neutrons, and electrons

What is the difference between speed and velocity? A) velocity describes speed with direction. B) there is no difference. C) Velocity describes direction with position. D) Velocity is used in space, while speed is used on earth.

How do you calculate resistance with coulombs, time and J's?

Difference between specific heat capacity and latent heat?