Wave Optics — Physics STD 12 Science — Question

A plane electromagnetic wave is travelling along Z-axis in vacuum. What can you say about the electric field and magnetic field vectors?

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

What type of wavefront will emerge from an (i) point source, and (ii) distant light source?

Can the peak voltage across the inductor be greater than the peak voltage of the source in an LCR circuit?

In a TV tube, electrons are accelerated from the rear to the front. What is the direction of the current?

Two equal balls having equal positive charge ‘q’ coulombs are suspended by two insulating strings of equal length. What would be the effect on the force when a plastic sheet is inserted between the two?

A long solenoid is fabricated by closely winding a wire of radius 0.5mm over a cylindrical nonmagnetic frame so that the successive turns nearly touch each other. What would be the magnetic field B at the centre of the solenoid if it carries a current of 5A?

A one meter long glass tube is open at both ends. One end of the tube is dipped into a mercury cup, the tube is kept vertical and the air is pumped out of the tube by connecting the upper end to a suction pump. Can mercury be pulled up into the pump by this process?

Can we define specific heat capacity for an adiabatic process?