Thermodynamics — Physics STD 12 Science — Question

Define Potential Gradient.

Explain the working of a transformer with a neat, labelled diagram.

Define: (a) Threshold frequency (b) Photoelectric work function.

The e.m.f. of a cell is balanced by a length of \(320 cm\) of the potentiometer wire. When a cell is shunted by a resistance of \(50 \Omega\) the balancing length is reduced by \(20 cm\). Find internal resistance of the cell.

The susceptibility of magnesium at \(300 K\) is \(2.4 \times 10^{-5}\). At what temperature will the susceptibility increase to \(3.6 \times 10^{-5}\) ?

The frequency of revolution of a particle performing circular motion changes from 60 r.p.m to 180 r.p.m. in 20 seconds. Calculate the angular acceleration of the particle. \((\pi=3.142)\)

The CGS unit of viscosity is the poise. Find the relation between the poise and the SI unit of viscosity.

A pipe which is open at both ends is \(47 cm\) loag and has an inner diameter \(5 cm\). If the speed of sound in air is \(348 m / s\), calculate the fundamental frequency of air column in that pipe.