NCERT Solutions For Class 12 Physics Chapter 11: Dual Nature of Radiation and Matter

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NCERT Solutions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter are provided in the article with a detailed explanation of all the concepts. A substance can have wave nature, exhibiting the phenomena of interference and diffraction, as well as a particle nature (quanta or light packets).

Unit 7 Dual Nature of Radiation and Matter along with Unit 8 Atoms and Nuclei has a weightage of 12 marks in the CBSE Class 12 Physics Examination. NCERT Solutions for Class 12 Physics Chapter 11 covers the concepts of the photoelectric effect and Electron Emission.

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NCERT Solutions for Class 12 Physics Chapter 11

Previous Year Questions

Which one among the following shows particle nature of light? [ NEET 2001]
The velocity of electron beam will be...[NEET 2001]
aximum torque exerted by the field on the dipole is….[KEAM]
The average velocity and the average speed of the toy car between 0to30to3 seconds are respectively….[NEET 2018]
The energy of most energetic photoelectron is…. [JIPMER 1999]
An example for the best source of monochromatic light is… [JKCET 2019]

Class 12 Physics Chapter 11 – Topics Covered

Photoelectric Effect is the phenomenon of emission of photoelectron from the metal surface when a beam of light of suitable frequency is incident on it.

The electrons that are emitted from the surface are known as photoelectrons and the current produced is known as the photoelectric current.

Effect of Intensity of Light on Photo current: For a fixed frequency of incident radiation, the photoelectric current linearly increases with an increase in the intensity of incident light.

Effect of Intensity of light on photocurrent

Work Function is the minimum amount of energy that is required to eject an electron from the outermost surface of a metal.

$Work\ Function, W = hv_o\ (threshold\ frequency)= {hc \over \lambda_0 (threshold\ wavelength)}$

For a given frequency of incident radiation, the minimum negative potential V₀ given to a plate for which the photoelectric current becomes zero is known as cut-off or stopping potential.

$KE_{max} = eV_0 => {1 \over 2} mv^2_{max} = eV_0$

Einstein Photoelectric Equation: When hv is the energy of photon and Ф is the work-function, the equation is given by:

$K_{max} = hv - \Phi0$

Also Read:

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CBSE CLASS XII Related Questions

1.
Two air-filled capacitors of capacitances $C_1$ and $C_2$ are connected in parallel with a dc battery. After the capacitors are fully charged, a slab of dielectric constant K is inserted between the plates of each capacitor. How will the (i) charge on each capacitor and (ii) energy stored in the capacitor affected after the slab is introduced.
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2.
With the help of a labelled diagram, explain the principle, construction and working of an a.c. generator.
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Derive an expression for the capacitance of a parallel plate capacitor of plate area A and plate separation d with air present between the plates.
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Write two advantages of reflecting telescope over refracting telescope.
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5.
A charged particle $+q$ in an electric field $\vec{E}$ experiences a force in the direction of the electric field. As a result, its kinetic energy changes. Similarly, the charged particle also experiences a force when it moves in a magnetic field $\vec{B}$. But this magnetic force is perpendicular to both velocity $\vec{v}$ of the charged particle and the magnetic field $\vec{B}$, so it cannot change the kinetic energy of the charged particle. Consider two charged particles 1 and 2 of masses $m$ and $\frac{m}{2}$ having charges $-q$ and $+2q$ respectively. They are accelerated from rest through the same potential difference $V$ and acquire kinetic energy $K_1$ and $K_2$. Then they enter in a region of uniform magnetic field $\vec{B}$ perpendicular to their velocities.
6.
Capacitors are manufactured with certain standard capacitances and working voltages. However, these standard values may not be the ones that are actually needed in a particular application. Two or more capacitors can be grouped in series or in parallel to achieve desired capacitance and voltage. When connected in series, the total capacitance decreases while the voltage rating increases, whereas in parallel connections, the total capacitance increases and maintains the same voltage rating. A capacitor stores energy in the electric field between its plates and stored energy is proportional to the square of the voltage and capacitance $U = \frac{1}{2}CV^2$, where symbols have their usual meanings.
Two capacitors, one of $3 \ \mu$F and the other of $6 \ \mu$F, are connected in series in the circuit as shown in the figure, for a long time. }