Determine the a) energy (in ev) and b) wavelength (in cm) corresponding to blue light of frequency 670 thz

Answer :

(a) The energy of blue light (in eV) is 2.77 eV

(b) The wavelength of blue light is

Explanation:

The relation between the energy and frequency is:  

where,

h = Plank's constant =

Given :

Frequency =

Conversion used :

So,  

Also,  

So,  

The energy of blue light (in eV) is 2.77 eV

The relation between frequency and wavelength is shown below as:

Where,

c = the speed of light =

Frequency =

So, Wavelength is:

Conversion used :

The wavelength of blue light is

law of conservation of matter

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