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#1 Class 12 Physics Dual Nature of Radiation and Matter 2022 Short 3M CBSE

The de-Broglie wavelength associated with an electron is 0.30 nm. Calculate: (a) the speed, and (b) the kinetic energy (in eV), of the electron.

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#2 Class 12 Physics Wave Optics 2022 Short 3M CBSE

Using Huygens' principle, for a plane wavefront incident on a plane reflecting surface, draw the reflected wavefront. Hence prove laws of reflection.

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#3 Class 12 Physics Semiconductor 2022 Short 2M CBSE

Distinguish between intrinsic and extrinsic semiconductors. Although in an extrinsic semiconductor $n_e \neq n_h$, yet it is electrically neutral. Why?

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#4 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 3M CBSE

Find the two possible positions of an object kept in front of a lens of $+5.0\,\text{D}$, so that the image formed in both cases is four times magnified.

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#5 Class 12 Physics Atoms 2022 Short 3M CBSE

(a) Sketch the energy level diagram for hydrogen atom. (b) Find the ratio of the longest and the shortest wavelength in Lyman series in hydrogen atom.

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#6 Class 12 Physics Dual Nature of Radiation and Matter 2022 Short 3M CBSE

Ultra-violet light of wavelength 200 nm from a source is incident on a metal surface. If the stopping potential is $-2.5\,\text{V}$, (a) calculate the work function of the metal, and (b) How would the surface respond ...

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#7 Class 12 Physics Semiconductor 2022 Short 2M CBSE

Explain the formation of depletion layer and barrier potential in a p-n junction diode.

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#8 Class 12 Physics Wave Optics 2022 Mcq 1M CBSE

CASE STUDY PASSAGE — Young's Double Slit Experiment: The principle of superposition is used to understand the phenomenon of interference of light waves. The principle states that at a particular point, the resultant d...

A. It remains constant in both cases.

B. It decreases in both cases.

C. It remains constant in (i) but decreases in (ii).

D. It decreases in (i) but remains constant in (ii).

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#9 Class 12 Physics Wave Optics 2022 Mcq 1M CBSE

CASE STUDY PASSAGE — Young's Double Slit Experiment: The principle of superposition is used to understand the phenomenon of interference of light waves. The principle states that at a particular point, the resultant d...

A. 480 nm

B. 560 nm

C. 640 nm

D. 680 nm

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#10 Class 12 Physics Wave Optics 2022 Mcq 1M CBSE

CASE STUDY PASSAGE — Young's Double Slit Experiment: The principle of superposition is used to understand the phenomenon of interference of light waves. The principle states that at a particular point, the resultant d...

A. $$\omega_2 > \omega_1 > \omega_3$$

B. $$\omega_1 > \omega_2 > \omega_3$$

C. $$\omega_2 > \omega_3 > \omega_1$$

D. $$\omega_3 > \omega_1 > \omega_2$$

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#11 Class 12 Physics Wave Optics 2022 Mcq 1M CBSE

CASE STUDY PASSAGE — Young's Double Slit Experiment: The principle of superposition is used to understand the phenomenon of interference of light waves. The principle states that at a particular point, the resultant d...

A. Zero

B. $$I_0$$

C. $$2I_0$$

D. $$4I_0$$

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#12 Class 12 Physics Wave Optics 2022 Mcq 1M CBSE

CASE STUDY PASSAGE — Young's Double Slit Experiment: The principle of superposition is used to understand the phenomenon of interference of light waves. The principle states that at a particular point, the resultant d...

A. (i) and (ii)

B. (ii) and (iii)

C. (iii) and (iv)

D. (iv) and (i)

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#13 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 3M CBSE

(i) Trace the path of a ray of light PQ which is incident at an angle $i$ on one face of a glass prism of angle A. It then emerges out from the other face at an angle $e$. Use the ray diagram to prove that the angle t...

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#14 Class 12 Physics Wave Optics 2022 Short 3M CBSE

(i) Monochromatic light is incident on a surface separating two media. The frequency of the light after refraction remains unaffected but its wavelength changes. Why? (ii) The frequency of an electromagnetic radiation...

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#15 Class 12 Physics Semiconductor 2022 Short 3M CBSE

State the working principle of an LED. Write any two important advantages and two disadvantages of LED.

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#16 Class 12 Physics Dual Nature of Radiation and Matter 2022 Short 3M CBSE

Photoelectrons are emitted from a metal surface when illuminated with UV light of wavelength 330 nm. The minimum amount of energy required to emit the electrons from the surface is $3.5 \times 10^{-19}\,\text{J}$. Cal...

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#17 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 3M CBSE

A thin equiconvex lens with a radius of curvature $R$ and refractive index $\mu_1$ is placed coaxially and in contact with a thin equiconcave lens of the same radius of curvature $R$ and refractive index $\mu_2$ (wher...

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#18 Class 12 Physics Wave Optics 2022 Short 3M CBSE

A parallel beam of light of wavelength 600 nm is incident normally on a slit of width 0.2 mm. If the resulting diffraction pattern is observed on a screen 1 m away, find the distance of (i) first minimum, and (ii) sec...

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#19 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 3M CBSE

Explain with the help of a suitable diagram, the phenomenon on which an optical fibre works. Mention any two uses of optical fibres.

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#20 Class 12 Physics Nuclei 2022 Short 3M CBSE

Calculate the energy released in MeV in the following reaction: $^2_1H + ^3_1H \longrightarrow ^4_2He + n$ Given: $m\left(^2_1H\right) = 2.014102\,\text{u}$, $m\left(^3_1H\right) = 3.016049\,\text{u}$, $m\left(^4_2He\...

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