Nuclei — Physics STD 12 Science — Question

Why, some definite lines of atomic spectrum of matter is obtained?

Out of the following, which radiation has least frequency?Gamma rays, Infrared rays, X-rays, Blue light.

Write following radiations in descending order of wavelengths:X-rays, Radio waves, Ultraviolet waves, Gamma rays.

A capacitor has been charged by a dc source. What are the magnitudes of conduction and displacement currents, when it is fully charged?

Choose the correct alternative from the clues given at the end of the each statement:
The size of the atom in Thomson’s model is .......... the atomic size in Rutherford’s model. (much greater than/ no different from/ much less than.)

Which waves are used in telecommuni-cation? Write their range.

Answer the following question:
A charged particle enters an environment of a strong and non-uniform magnetic field varying from point to point both in magnitude and direction, and comes out of it following a complicated trajectory. Would its final speed equal the initial speed if it suffered no collisions with the environment?

Write the formula to find the value of electric field due to a uniformly charged infinite plane sheet.