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

What are the important points of wave theory of light?

What is the significance of electromagnetic wave theory of light?

Write a short note on quantum theory of light.

Why are dish antennas curved?

What type of lens is formed by a bubble inside water?

It is possible for two lenses to produce zero power?

A small disc is placed in the path of the light from a distance source. Will the center of the shadow be bright or dark?

When a wave undergoes reflection at a denser medium, what happens to its phase?

An object is placed at a certain distance from a convex lens of focal length 20 cm. Find the distance of the object if the image obtained is magnified 4 times.

An object is placed in front of a concave mirror of focal length 20 cm. The image formed is three times the size of the object. Calculate two possible distances of the object from the mirror.

A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. What is the distance between the first dark fringe on either side of the central bright fringe?

Suppose an alpha particle accelerated by a potential of V volt is allowed to collide with a nucleus whose atomic number is Z, then the distance of closest approach of alpha particle to the nucleus is ______.

In a hydrogen atom, the electron revolving in the fourth orbit, has angular momentum equal to ______.

The ratio between the first three orbits of a hydrogen atom is ______.

If the nuclear radius of ²⁷Al is 3.6 fermi, the approximate unclear radius of ⁶⁴ Cu is ______.

The wavelength λ_e of an electron and λ_p of a photon of same energy E are related by ______.

The wave associated with a moving particle of mass 3 × 10^–6 g has the same wavelength as an electron moving with a velocity 6 × 10⁶ ms^–1. The velocity of the particle is

If a light of wavelength 330 nm is incident on a metal with work function 3.55 eV, the electrons are emitted. Then the wavelength of the wave associated with the emitted electron is (Take h = 6.6 × 10^–34 Js)

Emission of electrons by the absorption of heat energy is called ____________ emission.

Why do metals have a large number of free electrons?