Physics Test 20...

If the potential difference of a 6µF capacitor is changed from 10V to 20V, the increase in energy stored will be

In scattering, the impact parameter b is defined as the:

The photoelectric threshold frequency of a metal is f₀. When light of frequency 4f₀is incident on the metal, the maximum K.E. of the emitted electron is​

The ionisation energy of hydrogen atom is 13.6eV, the ionisation energy of helium atom would be

Two point charges 10C and -10C are placed at a certain distance. What is the electric potential of their midpoint?

Photons of frequency f is incident on a metal surface of threshold frequency f₀ . The maximum K.E. of emitted photoelectrons is

Point charges + 4q, –q and +4q are kept on theX-axis at points x = 0, x =a and x = 2a respectively.

In the mass number range A = 30 to 170, the binding energy per nucleon is

The ratio of the speed of the electron in the ground state of hydrogen atom to the speed of light is

If the internal resistance of a cell is 20 ohm and resistance of the circuit is also 20 ohm. Will the current remain same whether the given n identical cells are in series or in parallel?