Solution

Solution

Mobility(μ)=er/m
It is independent of the applied potential difference, so it will not change if the applied potential difference will be doubled.

Solution

The minimum frequency of the radiation incident on a metal surface below which there is no photoelectric emission is called threshold frequency. It is a characteristic property of a photosensitive material.
OR
The amount of light energy or photon energy incident per meter square per second is called the intensity of radiation. SI unit of intensity of radiation is W/sr.

Solution

Solution

In sky wave mode of propagation, the frequency range of transmitting signals restricted to less than 30 MHz, because it is the maximum frequency below which the signals can be transmitted from one point to another point via reflection from the ionosphere.
OR
The ground wave propagation is preferred usually for long-distance communication using frequencies below 3 MHz. The range of coverage of ground wave propagation depends on transmitted power and frequency.

Solution

(i)In series combination,

(ii)In parallel combination,

Solution

In equiconcave lens, the radius of curvature of both surfaces is equal,

Solution

Solution

According to Bohr’s quantization of angular momentum, the stationary orbits are those in which angular momentum of electron

Solution

The signal transmitted from a TV tower cannot be received beyond a certain distance because of the curvature of the earth.the expression for the optimum separation between the receiving and the transmitting antenna:d=√2hR
d:optimum separation
h:height of the antenna
R:radius of the curvature of the earth