Author Question: Light shines through atomic hydrogen gas that was initially in its ground state. You observe that ... (Read 62 times)

jlmhmf · **on:** Jul 29, 2018

Light shines through atomic hydrogen gas that was initially in its ground state. You observe that after awhile much of the hydrogen gas has been excited to its n = 5 state.

What wavelength of light entering the gas caused this excitation? (c = 3.00 108 m/s, h = 6.626 10-34 J s, 1 eV = 1.60 10-19 J)
A) 110 nm
B) 91.4 nm
C) 95.2 nm
D) 2280 nm

Question 2

Consider a brick that is totally immersed in water. The long edge of the brick is vertical. The pressure on the brick is

A) the same on all surfaces of the brick.
B) greatest on the face with largest area.
C) greatest on the top of the brick.
D) greatest on the sides of the brick.
E) greatest on the bottom of the brick.