Inorganic and Applied Chemistry

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Inorganic and Applied Chemistry

Example 1- C:

Energy of a photon

A lamp emits blue light with a frequency of 6.7 1014 Hz. The energy of one photon in the blue light is to be

calculated. Since the frequency of the light is known, equation (1- 1) on page 15 can be used to calculate

the wavelength of the blue light:

m

s

m s

f

c f c^7

14 1

8

4. 510

6. 710

310 /



This wavelength of the blue light is inserted into equation (1- 2) (from page 18):

J

m

E h c J s m s

photon

19

7

8

(^344). 4 10
4. 510
6. 62610 310 /^
(^)
Now we have actually calculated the energy of one of the photons in the blue light that is emitted by the
lamp. From equation (1- 2) it is seen that the smaller the wavelength is, the more energy is contained in the
light since the photons each carries more energy.
In the next example we are going to use the famous Einstein equation (equation (1- 3) on page 18) to
evaluate the stability of a tin nucleus.
Atoms
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