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#1 Class 12 Physics Wave Optics 2024 Long 1M CBSE

[Case Study, Q30 contd.] (iv) Find the number of bright fringes formed due to interference on 1 m of screen placed $4/3$ m away from the slits.

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#2 Class 12 Physics Wave Optics 2024 Long 1M CBSE

[Case Study, Q30 contd.] (iii)(a) If instead of 450 nm, light of wavelength 680 nm is used, find the number of interference peaks within the central diffraction peak. OR (b) Consider the single-slit diffraction descri...

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#3 Class 12 Physics Wave Optics 2024 Long 1M CBSE

[Case Study, Q30 contd.] (ii) If the slit width is doubled while keeping the distance between the slits the same, find the number of interference peaks formed.

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#4 Class 12 Physics Wave Optics 2024 Long 1M CBSE

[Case Study] Diffraction and interference are closely related phenomena that occur together. Diffraction is the bending of light around the edges (corners) of an obstacle, while interference is the combination of wave...

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#5 Class 12 Physics Electric Charges and Fields 2024 Long 1M CBSE

[Case Study, Q29 contd.] (iv)(a) Let $E_1,E_2,E_3,E_4$ be the magnitudes of the electric field between the pairs of plates I, II, III, IV respectively. Compare them. OR (b) An electron is projected from the right plat...

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#6 Class 12 Physics Electric Charges and Fields 2024 Long 1M CBSE

[Case Study, Q29 contd.] (iii) Let $V_0$ be the potential at the left plate of any set, taken to be at $x=0$. The potential V at any point ($0\le x\le2$cm) between the plates of that set can be expressed as:

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#7 Class 12 Physics Electric Charges and Fields 2024 Long 1M CBSE

[Case Study, Q29 contd.] (ii) An electron is released midway between the plates of pair IV. What will it do?

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#8 Class 12 Physics Electric Charges and Fields 2024 Long 1M CBSE

[Case Study] The figure shows four pairs of parallel identical conducting plates (Sets I, II, III, IV), separated by the same distance 2.0 cm, arranged perpendicular to the x-axis. The electric potential of each plate...

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#9 Class 12 Physics Semiconductor 2024 Short 3M CBSE

(b) OR: On the basis of energy band diagrams, distinguish between (i) an insulator, (ii) a semiconductor, and (iii) a conductor.

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#10 Class 12 Physics Semiconductor 2024 Short 3M CBSE

(a) Draw the circuit diagrams for obtaining the V-I characteristics of a p-n junction diode. Explain briefly the salient features of the V-I characteristics in (i) forward biasing, and (ii) reverse biasing.

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#11 Class 12 Physics Nuclei 2024 Short 3M CBSE

(a) Define atomic mass unit (u). (b) Calculate the energy required to separate a deuteron into its constituent parts (a proton and a neutron). Given: $m(D)=2.014102$ u, $m_H=1.007825$ u, $m_n=1.008665$ u.

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#12 Class 12 Physics Atoms 2024 Short 3M CBSE

State Bohr's first and second postulates. Use them to derive an expression for the radius of the $n^{th}$ orbit in a hydrogen atom.

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#13 Class 12 Physics Electromagnetic Waves 2024 Short 3M CBSE

The electric field in an electromagnetic wave in vacuum is given by: $\vec E = (6.3\ N/C)[\cos(1.5\ rad/m)y+(4.5\times10^8\ rad/s)t]\hat i$. (a) Find the wavelength and frequency of the wave. (b) What is the amplitude...

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#14 Class 12 Physics Alternating Current 2024 Short 3M CBSE

A sinusoidal voltage is applied to an electric circuit containing a circuit element 'X' in which the current leads the voltage by $\pi/2$. (a) Identify the circuit element X. (b) Write the formula for its reactance. (...

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#15 Class 12 Physics Moving Charges and Magnetism 2024 Short 3M CBSE

Two long straight parallel conductors carrying currents exert a force on each other. Why? Derive an expression for the force per unit length between two long straight parallel conductors carrying currents in opposite ...

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#16 Class 12 Physics Current Electricity 2024 Short 3M CBSE

Determine the current in branches AB, AC and BC of the network shown in the figure. [Delta network: A-B via 4Ω, B-C via 2Ω, A-C via (10V battery + 1Ω), C-D via 2Ω, B-D via 2Ω, D-F via ε(5V) battery, A-B (lower) via 4Ω...

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#17 Class 12 Physics Semiconductor 2024 Short 2M CBSE

Suppose a pure Si crystal has $5\times10^{28}$ atoms $m^{-3}$. It is doped by 1 ppm concentration of boron. Calculate the concentration of holes and electrons, given $n_i=1.5\times10^{16}\ m^{-3}$. Is the doped crysta...

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#18 Class 12 Physics Dual Nature of Radiation and Matter 2024 Short 2M CBSE

The minimum intensity of white light that our eyes can perceive is about $0.1\ nW m^{-2}$. Calculate the number of photons of this light entering our pupil (area $0.4\ cm^2$) per second. (Take average wavelength of wh...

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#19 Class 12 Physics Ray Optics and Optical Instruments 2024 Short 2M CBSE

Explain the following: (a) For a simple microscope, the angular size of the object equals the angular size of the image. Yet it offers magnification. (b) Both plane and convex mirrors produce virtual images of objects...

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#20 Class 12 Physics Ray Optics and Optical Instruments 2024 Short 2M CBSE

The magnifying power of an astronomical telescope is 24. In normal adjustment, the distance between its two lenses is 150 cm. Find the focal length of the objective lens.

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