PLS HELP ME FAST SOMEONE

Question

The speed of a light wave c is related to its wavelength λ and its frequency f by C=λf. If the speed of light is 3 × 10^8 meters/second and the wavelength of an infrared wave used in a remote control is 7 × 10^-9 meters, then what us it's frequency

A) 2 × 10^-17 Hz

B) 2 × 10^0 Hz

C) 4 × 10^16 Hz

D) 4 × 10^-2 Hz



Answer 1

Sarah

C=lambda F

so f=C/lambda

Answer 2

Sarah, if from formula c = fλ, you cannot get the formula for f = c/λ, then you do need to have a tutor in math.

The right answer is (C).