Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

A cubical block of wood weighing 200g has a lead piece fastened underneath. Find the mass of the lead piece which will just allow the block to float in water. Specific gravity of wood is 0.8 and that of lead is 11.3.

Write any two characteristic properties of nuclear force.

To measure the magnetic moment of a bar magnet, one may use:

There is force of repulsion between two parallel current carrying conductors. What idea we get about direction of flow of current?

Write the expression for the de Broglie wavelength associated with a charged particle having charge ‘q’ and mass ‘m’, when it is accelerated by a potential V.

Can we define specific heat capacity for an adiabatic process?

If coherent waves of light produce destructive interference, then what will be the phase difference between them?

Write principle for producing the electromagnetic waves.

Light passes through a closed cylindrical tube containing a gas. If the gas is gradually pumped out, the speed of light inside the tube will:

1. Increase.
2. Decrease.
3. Remain constant.
4. First increase and then decrease.