Physics Ncert Solutions Class 12th

A signal of 100 THz frequency can be transmitted with maximum efficiency by:

Given below are two statements:

Statement I : Davission-Germer experiment establishes, the wave nature of electrons.

Statement II : If electrons have wave nature, they can interfere and show diffraction.

In the light of the above statements choose the correct answer from the option given below:

2SO₂(g) + O₂(g) → 2SO₃(g)
The above reaction is carried out in a vessel starting with partial pressure Pso₂ = 250 m bar, Po₂ = 750 m bar and Pso₃ = 0 bar. When the reaction is complete, the total pressure in the reaction vessel is _____ m bar. (Round off to the Nearest Integer).

Radiation from hydrogen gas excited to first excited state is used for illuminating certain metallic plate. When the same plate is exposed to the radiation from some unknown hydrogen like gas excited to the same level it is found that de-Broglie wavelength of fastest photoelectron has decreased by 2.3 times. It is given that energy corresponding to longest wavelength of Lyman series of the unknown gas is 3 times the ionization energy of hydrogen gas (13.6eV). The work function (in eV) of the metallic plate is ______. [Take (2.3)² = 5.25]

Two conducting circular loops of radii R₁ and R₂ are placed in the same plane with their centres coinciding. If R₁ » R₂, the mutual inductance M between them will be directly proportional to:

For the following logic circuit, the truth table is:

A series LCR circuit containing 5.0H inductor, 80μF capacitor and 40Ω resistor is connected to 230 V variable frequency ac source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be:

A uniform conducting wire of length 12a and resistance ' R ' is wound up as a current
carrying coil in the shape of,
(i) an equilateral triangle of side ' a '.
(ii) a square of side ' a '.
The magnetic dipole moments of the coil in each case respectively are:

A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?

For the given circuit, the input digital signals are applied at the terminals A, B and C. What would be the output at the terminal y?