Author Question: A glass window is installed in the window space and the intensity level of the sound entering ... (Read 157 times)

serike · **on:** Jul 29, 2018

A glass window is installed in the window space and the intensity level of the sound entering through the window is reduced from 72 dB to 47 dB.

The factor, by which the acoustic power entering the chamber is reduced by the glass window, is closest to: A) 3.2 10-3
B) 2.2 10-2
C) 5.6 10-2
D) 1.0 10-1
E) 1.5 10-1

Question 2

If a hydrogen atom in the ground state absorbs a photon of energy 12.09 eV, to which energy state will it make a transition?

A) n = 2
B) n = 3
C) n = 4
D) n = 5