Alaboratory uses a laser with a light wavelength of 910nm. if the lab turns the laser on for 20 picoseconds, how many wavelengths can be found in the resulting wave pulse?

6593.4

Explanation:

wavelength, λ = 910 nm = 910 x 10^-9 m

Speed of laser = 3 x 10^8 m/s

t = 20 pico seconds

Distance traveled by laser in this time, d = c x t

d = 3 x 10^8 x 20 x 10^-12 = 6 x 10^-3 m

number of wavelengths, n = d / λ

n = (6 x 10^-3) / (910 x 10^-9)

n = 6593.4

260 miles per hour

explanation:

we need to know the time interval during which the force acts. impulse of force = momentum change