Author Question: The efficiency of classroom-demonstration lasers is typically A) about one percent. B) about ten ... (Read 26 times)

Wadzanai · **on:** Jul 29, 2018

The efficiency of classroom-demonstration lasers is typically

A) about one percent.
B) about ten percent.
C) about twenty percent.
D) more than twenty percent.

Question 2

Compared to the energy put into a laser, the energy of the laser beam is

A) usually much more.
B) much less.
C) the same.
D) none of the above