Author Question: A certain laser radiates with a wavelength of 2488 nm. What is the energy difference, in electron ... (Read 40 times)

bobypop · **on:** Jul 29, 2018

A certain laser radiates with a wavelength of 2488 nm. What is the energy difference, in electron volts, between the two energy levels involved in producing this light?

A) 0.50 eV
B) 0.65 eV
C) 0.45 eV
D) 0.60 eV
E) 0.55 eV

Question 2

Bumpers on cars are not of much use in a collision. To see why, calculate the average force a bumper would have to exert if it brought a 1200-kg car

(a so-called compact model) to a rest in 15 cm when the car had an initial speed of 2.0 m/s (about 4.5 mph). (Bumpers are built with springs that compress to provide a stopping force without, hopefully, denting the metal.)
A) 1.8 104 N
B) 1.6 104 N
C) 5.4 104 N
D) 6.5 105 N
E) 3.2 104 N