# Chemistry Class 11 NCERT Solutions: Chapter 2 Structure of Atom Part 3

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Q: 6. Find energy of each of the photons which

(i) Correspond to light of frequency

(ii) Have wavelength of

Answer:

(i) Energy (E) of a photon is given by the expression,

Where,

= frequency of light

Substituting the values in the given expression

(ii) Energy (E) of a photon having wavelength (λ)**is given by the expression,**

Substituting the values in the given expression of E:

Q: 7. Calculate the wavelength, frequency and wave number of a light wave whose period is .

Answer:

Wavelength () of light

Where,

Substituting the value in the given expression of

Wave number

Q: 8. What is the number of photons of light with a wavelength of 4000 pm that provide 1 J of energy?

Answer;

Where,

wavelength of light

Substituting the values in the given expression of n:

Hence, the number of photons with a wavelength of 4000 pm and energy of photons.