HSC Science कक्षा १२ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Physics

Calculate the maximum kinetic energy and maximum velocity of the photoelectrons emitted when the stopping potential is 81 V for the photoelectric emission experiment.

Calculate the energies of the photons associated with the following radiation:

1. violet light of 413 nm
2. X-rays of 0.1 nm
3. radio waves of 10 m

How many photons of frequency 10¹⁴ Hz will make up 19.86 J of energy?

When a light of frequency 9 × 10¹⁴ Hz is incident on a metal surface, photoelectrons are emitted with a maximum speed of 8 × 10⁵ ms⁻¹. Determine the threshold frequency of the surface.

When a 6000 Å light falls on the cathode of a photo cell, photoemission takes place. If a potential of 0.8 V is required to stop emission of electron, then determine the

1. frequency of the light
2. energy of the incident photon
3. work function of the cathode material
4. threshold frequency and
5. net energy of the electron after it leaves the surface.

A 3310 Å photon liberates an electron from a material with energy 3 × 10⁻¹⁹ J while another 5000 Å photon ejects an electron with energy 0.972 × 10⁻¹⁹ J from the same material. Determine the value of Planck’s constant and the threshold wavelength of the material.

At the given point of time, the earth receives energy from the sun at 4 cal cm^–2 min^–1. Determine the number of photons received on the surface of the Earth per cm2 per minute. (Given: Mean wavelength of sunlight = 5500 Å)

UV light of wavelength 1800 Å is incident on a lithium surface whose threshold wavelength is 4965 Å. Determine the maximum energy of the electron emitted.

Doping a semiconductor result in

Why is temperature co-efficient of resistance negative for semiconductor?

What do you mean by doping?

Distinguish between intrinsic and extrinsic semiconductors.

Why can’t we interchange the emitter and collector even though they are made up of the same type of semiconductor material?

Elucidate the formation of n-type extrinsic semiconductors.

The particle size of ZnO material is 30 nm. Based on the dimension it is classified as

Which one of the following is the natural nanomaterial.

The blue print for making ultra-durable synthetic material is mimicked from ____________.

The method of making nanomaterial by assembling the atoms is called ____________.

“Ski wax” is an application of nano product in the field of ____________.

The particle which gives mass to protons and neutrons are ____________.