Question

What is the frequency of a wave of red light in the air where its wavelength is 6.8×10−7m?

Answer 1

Approximately `4.41*10^14` meters.

Explanation:

Frequency of a photon is given by the equation:

`f=c/lambda`

where:

• `f` is the frequency in hertz `(1 \ "Hz"-=1 \ "s"^-1)`

• `c` is the speed of light, which is approximately `3*10^8 \ "m/s"`

• `lambda` is the wavelength in meters

So, we get:

`f=(3*10^8color(red)cancelcolor(black)"m""s"^-1)/(6.8*10^-7 color(red)cancelcolor(black)"m")`

`~~4.41*10^14 \ "m"`