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

##### 1 Answer

Jul 1, 2018

Approximately

#### Explanation:

Frequency of a photon is given by the equation:

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: