4. The mass of an electron is 9.11 x 1031 kg. The mass of a proton is 1.67 x 107 kg. They are about 1.0 x 10-10 m apart in a hydrogen atom. What is the gravitational force between these two
particles in the hydrogen atom?

spectral lines lyman is one set

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle