Question

When giving presentations, many people use a laser pointer to direct the attention of the audience to information on a screen. If a 2.8-mW (time-averaged power) pointer creates a spot on the screen that has a 3.2 mm radius, what is the radiation pressure on a screen that reflects all of the light?

i. 1.86 x 10^-9 Pa

ii. 5.83 x 10^-9 Pa

iii. 5.80 x 10^-7 Pa

iv. 1.75 Pa

When giving presentations, many people use a laser pointer to direct the attention of the audience to information on a screen. If a 2.8-mW (time-averaged power) pointer creates a spot on the screen that has a 3.2 mm radius, what is the radiation pressure on a screen that reflects all of the light?

i. 1.86 x 10^-9 Pa

ii. 5.83 x 10^-9 Pa

iii. 5.80 x 10^-7 Pa

iv. 1.75 Pa

Answer 1