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# Solution - A Mercury Lamp is a Convenient Source for Studying Frequency Dependence of Photoelectric Emission, since It Gives a Number of Spectral Lines Ranging from the Uv to the Red End of the Visible Spectrum. in Our Experiment with Rubidium Photo-cell, the Following Lines from a Mercury Source Were Used: - Experimental Study of Photoelectric Effect

ConceptExperimental Study of Photoelectric Effect

#### Question

A mercury lamp is a convenient source for studying frequency dependence of photoelectric emission, since it gives a number of spectral lines ranging from the UV to the red end of the visible spectrum. In our experiment with rubidium photo-cell, the following lines from a mercury source were used:

λ1 = 3650 Å, λ2= 4047 Å, λ3= 4358 Å, λ4= 5461 Å, λ5= 6907 Å,

The stopping voltages, respectively, were measured to be:

V01 = 1.28 V, V02 = 0.95 V, V03 = 0.74 V, V04 = 0.16 V, V05 = 0 V

Determine the value of Planck’s constant h, the threshold frequency and work function for the material.

[Note: You will notice that to get from the data, you will need to know (which you can take to be 1.6 × 10−19 C). Experiments of this kind on Na, Li, K, etc. were performed by Millikan, who, using his own value of (from the oil-drop experiment) confirmed Einstein’s photoelectric equation and at the same time gave an independent estimate of the value of h.]

#### Solution

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#### APPEARS IN

NCERT Physics Textbook for Class 12 Part 2
Chapter 11: Dual Nature of Radiation and Matter
Q: 28 | Page no. 410

#### Reference Material

Solution for question: A Mercury Lamp is a Convenient Source for Studying Frequency Dependence of Photoelectric Emission, since It Gives a Number of Spectral Lines Ranging from the Uv to the Red End of the Visible Spectrum. in Our Experiment with Rubidium Photo-cell, the Following Lines from a Mercury Source Were Used: concept: Experimental Study of Photoelectric Effect. For the courses CBSE (Arts), CBSE (Commerce), CBSE (Science)
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