A-HA!
Thank you! I now get the answer 2×107.
Yeah, I did look at the 2000s and think that was a tad wrong...
I'm now torn between being pleased that I knew how to work out the answer and the dismay of not being able to use a calculator.
Thank you again!
Homework Statement
A source of light emits a train of waves lasting 0.04 μs. The light has a wavelength of 600nm and the speed of light is 3×108ms-1. How many complete waves are sent out?
a)2.0×107
b)4.5×107
c)2.0×1010
d)4.5×1013
Homework Equations
f=v/wavelength (sorry, I couldn't...