What is the effect on the volume of a rectangular prism if the width is doubled and the hight is reduced to half of the original height? a) the volume is doubled. b) the volume is halved. c) the volume is tripled. d) the volume is unchanged.

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=

Amagnetic field applies forces on: a)static chargesb)moving chargesc)water flow

If you let go of the notebook after lifting it, will it move? how?