class 12 physics chapter 11 important questions
class 12 physics chapter 11 important questions
Practice these questions of class 12 physics chapter 11 important questions previous year questions to get more marks in your class 12 physics board exam.
Long Type-
1. What do you mean by Debrogli wave? Describe Davisson and Germer’s experiment to demonstrate the wave nature of electron.
2. What is photo electric emission effect ? What are the laws of photoelectric emission effect ? How did Einstein explained these laws of photo electric effect ?
Bihar Board -2016
OR
Write down Einstein’s photoelectric equation and explain the photoelectric effect on its basis.
Bihar Board -2015
OR
What is photo electric emission effect ? What are the laws of photoelectric emission effect ? How did Einstein explained the observed facts of photo electric effect ?
Bihar Board -2014
OR
Explain the phenomena of photoelectric emission ? What are the laws of photoelectric emission effect ? How are they explained by Einstein ?
Bihar Board -2011
Short Type-
1. What is de-Broglie wave? Write an expression for its wavelength.
Bihar Board- 2013
2. Define threshold frequency, work function, and stopping potential with reference to photoelectric effect.
Bihar Board- 2014
3. Define stopping potential.
Bihar Board- 2014
4. Thermionic emission only occurs on metal surface. why?
5. Show that the de Broglie wavelength of electron of energy E is given by the relation \[\lambda =\frac{h}{\sqrt{2mE}}\].
Bihar Board- 2009
6. What do you mean by photo electric effect.
7. Photo electric current is directly proportional to intensity of light but maximum velocity of photo electrons does not depend upon intensity of light. Explain.
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