Question

A laser dazzles the audience in a rock concert by emitting green light with a wavelength of 515 nm. How do you calculate the frequency of the light?

Answer 1

The frequency can be calculated by considering that speed is position over time.

`v = (Deltax)/(Deltat) = (Deltax) * 1/(Deltat)`

Analogously, the speed of light is `c = 2.998xx10^8` in `"m/s"`, the displacement of the light as it propagates over time is its wavelength in `"m"`, and if we set `t_0 = "0 s"`, then `Deltat = t` and `1/t = nu`, the frequency, in `"s"^(-1)`.

`=> bb(c = lambdanu)`

Therefore, the frequency is:

`color(blue)(nu) = c/lambda`

`= (2.998xx10^(8) "m/s")/(515xx10^(-9) "m")`

`= color(blue)(5.82xx10^14 "s"^(-1))`

What part of the electromagnetic spectrum was this?