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Photon fundamentals.(a) Show that hc= 1240
Chapter , Problem 1P(choose chapter or problem)
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)