Semiconductor Electronics: Materials, Devices and Simple Circuits — Physics STD 12 Science — Question

Write names of those radiations of electromagnetic radiations which are :(i) used in satellite communication (ii) used to study crystal structure (iii) produced as a result of decay of radioactive nucleus (iv) wavelength in between 350 nm and 770 nm (v) absorbed by the ozone layer (vi) produce extensive heating effect.

Two wires one of copper and other of manganin have same resistance and equal length. Which wire is thicker and why?

If the speed of a transverse wave on a stretched string of length 1m is 60m/s, what is the fundamental frequency of vibration?

Two equal point charges are placed at a dis- tance of 1 meter from each other, experience a force of 8N. If these charges are kept in water at the same distance, then how much force will be felt between them?

If all the particles of a system lie in X-Y plane, is it necessary that the centre of mass be in X-Y plane?

A bar magnet is moved in the direction indicated by the arrow between two coils PQ and CD. Predict the directions of induced current in each coil.

What is the geometrical shape of equipotential surfaces due to a single isolated charge?

On which factor the value of stopping potential depend?

How does the value of capacitance depend on the condition of the dielectric material when the space between the plates of a parallel plate capacitor is partially filled with a dielectric material?