Electromagnetic Waves — Physics STD 12 Science — Question

Why is it easier to swim in sea water than in fresh water?

The value of photoelectric current depend on which factor at constant frequency?

A capacitor has capacitance C. Is this information sufficient to know what maximum charge the capacitor can contain? If yes, what is this charges? If no, what other information is needed?

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.

Current I flow through two parallel straight wires in the same direction/The wires are at a distance 2r from each other. What is the intensity of magnetic field atw the midpoint between the two wires?

What is the order of energy gap in a semiconductor?

What is mobility? Write its expression also.

What will be the difference in the chemical properties of radioactive isotopes and stable isotopes of an element?

The binding energy per nucleon of the two nuclei A and B are 4 MeV and 8.2 MeV. Which of the two nuclei is more stable?