Photon fundamentals.(a) Show that hc= 1240

Chapter , Problem 1P

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QUESTION:

Problem 1P

Photon fundamentals.

(a) Show that hc= 1240 eV∙nm.

(b) Calculate the energy of a photon with each of the following wavelengths: 650 nm (red light); 450 nm (blue light); 0.1 nm (x-ray); 1 mm (typical for the cosmic background radiation).

(c) Calculate the number of photons emitted in one second by a 1-milliwatt red He-Ne laser (λ = 633 nm).

Questions & Answers

QUESTION:

Problem 1P

Photon fundamentals.

(a) Show that hc= 1240 eV∙nm.

(b) Calculate the energy of a photon with each of the following wavelengths: 650 nm (red light); 450 nm (blue light); 0.1 nm (x-ray); 1 mm (typical for the cosmic background radiation).

(c) Calculate the number of photons emitted in one second by a 1-milliwatt red He-Ne laser (λ = 633 nm).

ANSWER:

Solution 1P

(a) In the given expression, ,  Planck’s constant and Speed of light.

Step 1

Planck’s constant

Speed of light

Substituting these values,

…..(1)

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