Find energy of each of the photons which | Class 11 Chemistry Chapter Structure of Atom, Structure of Atom NCERT Solutions

Question:

Find energy of each of the photons which

(i) correspond to light of frequency 3× 1015 Hz.

(ii) have wavelength of 0.50 Å.

Answer:

Planck’s quantum theory = Based on the assumption that all atoms on the surface of the heated solid vibrate at the frequency, Planck developed a model that came to be known as Planck’s equation. Through experiments of frequencies and temperature, Planck was able to generate a constant, Planck’s constant

                                                           h = 6.62607 x 10-34 J s 

Using this constant he was able to restate his theory: energy was directly proportional to frequency. He wrote his equation as 

                                                          E=hν

where E is energy, h is Planck’s constant, and v is frequency.

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

E=hν

Where, h = Planck’s constant = 6.626 × 10–34 Js

ν = frequency of light = 3 × 1015 Hz

Substituting the values in the given expression E = hv we get

E = (6.626 × 10–34) (3 × 1015)

E = 1.988 × 10–18 J

 

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

 where , h = Planck’s constant = 6.626 × 10–34 Js

c = velocity of light in vacuum = 3 × 108 m/s

Substituting the values in the given expression of E:


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Comments

  • Shamil pp
  • 2019-08-19 21:08:20

You explained very simply...... so this is very usefull.... thank you al😍😍


  • Shamil pp
  • 2019-08-19 21:07:43

You explained very simply...... so this is very usefull.... thank you al😍😍


  • Shivam rawat
  • 2019-08-03 21:59:36

Thank you


  • Rajat rana
  • 2019-08-02 12:55:45

Thanks to all


  • Vishal pal
  • 2019-03-07 10:12:15

Har question ka jawab nahi milta hai


  • Abhay kumar
  • 2019-01-20 19:58:14

thank you!


  • satyam
  • 2019-01-16 15:21:35

thanks......bhai


  • Sneha
  • 2018-09-27 20:26:37

Thanks


  • Harsh
  • 2018-09-08 16:14:11

Thanks


  • iba babu
  • 2017-08-16 19:07:03

thanks


Comment(s) on this Question

Welcome to the NCERT Solutions for Class 11 Chemistry - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 6: Find energy of each of the photons which (i) correspond to light of frequency 3× 1015 Hz. ....