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Physics
Dual Nature of Radiation and Matter
Recommended PYQs (STRICTLY NCERT Based)
Photoelectric Effect: Experiment (17 Qs)

1(current)
2

Q. No.

The work functions of Caesium \((\mathrm{Cs})\), Potassium \((\mathrm{K})\) and Sodium \((\mathrm{Na})\) are \(2.14~\text{eV}\), \(2.30~\text{eV}\) and \(2.75~\text{eV}\) respectively. If incident electromagnetic radiation has an incident energy of \(2.20~\text{eV}\). which of these photosensitive surfaces may emit photoelectrons?

1.	\(\mathrm{Na}\) only	2.	\(\mathrm{Cs}\) only
3.	Both \(\mathrm{Na}\) and \(\mathrm{K}\)	4.	\(\mathrm{K}\) only

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The maximum kinetic energy of the emitted photoelectrons in photoelectric effect is independent of:

1.	work function of material
2.	intensity of incident radiation
3.	frequency of incident radiation
4.	wavelength of incident radiation

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In a photoelectric experiment, blue light is capable of ejecting a photoelectron from a specific metal while green light is not able to eject a photoelectron. Ejection of photoelectrons is also possible using light of the colour:
1. yellow
2. red
3. violet
4. orange

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Light of a frequency of \(1.5\) times the threshold frequency is incident on a photosensitive material. What happens to the photoelectric current when the frequency is cut in half and the intensity is doubled?

1.	four times	2.	one-fourth
3.	zero	4.	doubled

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The work function of the photosensitive material is \(4.0~\text{eV}\). The longest wavelength of light that can cause photoelectric emission from the substance is (approximately):
1. \(3100~\text{nm}\)
2. \(966~\text{nm}\)
3. \(31~\text{nm}\)
4. \(310~\text{nm}\)

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In the photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is:

1. 1.3 V

2. 0.5 V

3. 2.3 V

4. 1.8 V

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A source S₁ is producing 10¹⁵ photons per sec of wavelength 5000 Å. Another source S₂ is producing 1.02×10¹⁵ photons per second of wavelength 5100 Å. Then, (power of S₂)/(power of S₁) is equal to:

1. 1.00

2. 1.02

3. 1.04

4. 0.98

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Monochromatic light of wavelength 667 nm is produced by a helium-neon laser. The power emitted is 9mW. The number of photons arriving per second on average at a target irradiated by this beam is:

1. 9 x 10¹⁷

2. 3 X 10¹⁶

3. 9 x 10¹⁵

4. 3 X 10¹⁹

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The figure shows a plot of photocurrent versus anode potential for a photosensitive surface for three different radiations. Which one of the following is a correct statement?

1.	Curves \(a\) and \(b\) represent incident radiations of different frequencies and different intensities.
2.	Curves \(a\) and \(b\) represent incident radiation of the same frequency but of different intensities.
3.	Curves \(b\) and \(c\) represent incident radiation of different frequencies and different intensities.
4.	Curves \(b\) and \(c\) represent incident radiations of the same frequency having the same intensity.

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The number of photoelectrons emitted for the light of a frequency

ν

(higher than the threshold frequency

ν

₀) is proportional to:

ν

ν

₀

2. threshold frequency (

ν

₀)

3. intensity of light

4. frequency of light (

ν

)

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Molecular Basis of Inheritance
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Some Basic Concepts of Chemistry
Structure of Atom
Classification of Elements and Periodicity in Properties
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States of Matter
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Equilibrium
Redox Reactions
Hydrogen
The s-Block Elements
The p-Block Elements-XI
Organic Chemistry - Some Basic Principles and Techniques
Hydrocarbons
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The Solid State
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Chemical Kinetics
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General Principles and Processes of Isolation of Elements
The p-Block Elements-XII
The d and f Block Elements
Coordination Compounds
Haloalkanes and Haloarenes
Alcohols, Phenols and Ethers
Aldehydes, Ketones and Carboxylic Acids
Amines
Biomolecules
Polymers
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Units and Measurement
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Motion in A Straight Line
Motion in A Plane
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Nuclei
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