Answer:
Explanation:
Light is usually measured by its wavelength or its frequency. Frequency of light is used to represent the number of light waves that passes through a given point per second. Frequency is usually measured in Hertz, Hz.
The formula that relates the frequency of light to it's wavelength is
c = f × lamba
Where c = the speed or velocity of light = 300000000 m/s
Lamba = wavelength
We are given that the wavelength of the light is 1.247 × 10^-7
cm. We will convert 1.247 × 10^-7
cm to meter.
Since 100 centimetres = 1metre
1.247 × 10−7 cm would become
1.247 × 10^-7 /100 = 1.247 × 10^-9m
Frequency of light =speed of light/ wavelength
= 300000000/1.247 × 10^-9
= 240577385725741792 Hz