ISC (Science) ISC Class 12 - CISCE Question Bank Solutions for Physics (Theory)

Name the part of the electromagnetic spectrum which is: 
Suitable for radar systems used in aircraft navigation.

Name the part of the electromagnetic spectrum which is: 
Produced by bombarding a metal target with high electrons.

Calculate the shortest wavelength of electromagnetic radiation present in Balmer series of hydrogen spectrum.

What is meant by the statement: "Relative permittivity of water is 81"?

Name the electromagnetic radiation whose frequency is 10 Hz.

What is the speed of radio waves in vacuum?

What happens when an electron collides with a positron?

Name the electromagnetic radiation that has been used in obtaining the image below.

What is the wavelength range of electromagnetic radiation used in radio broadcast?

In an atom X, electrons absorb the energy from an external source. This energy “excites” the electrons from a lower-energy level to a higher-energy level around the nucleus of the atom. When electrons return to the ground state, they emit photons.

The figure below is the energy level diagram of atom X with three energy levels, E₁ = 0.00eV, E₂ = 1.78eV and E₃ = 2.95eV. The ground state is considered 0 eV for reference. The transition of electrons takes place between levels E₁ and E₂.

1. What wavelength of radiation is needed to excite the atom to energy level E₂ from E₁?
2. Suppose the external source has a power of 100 W. What would be the rate of photon emission?

What is mass defect?

Calculate the minimum wavelength of the spectral line present in Balmer series of hydrogen

Define equipotential surface. 

Name the series in the atomic spectra of the hydrogen atom that falls in the ultra violet region. 

When a beam of white light is passed through sodium vapors and then through a spectrometer, spectrum so obtained has two dark lines present in the yellow region. This spectrum is called:

What is meant by an equipotential surface?

Name the series of lines of hydrogen spectrum which lie in the ultraviolet region.

Name the series of lines of hydrogen spectrum which lie in the visible region.

In Young’s double slit experiment, show graphically how the intensity of light varies with distance

What should be the path difference between two waves reaching a point for obtaining constructive interference in Young’s Double Slit experiment ?