Atoms — Physics STD 12 Science — Question

If ni is density of intrinsic charge carriers; nh and ne are densities of hole and electrons in extrinsic semiconductor, what is the relation among them?

What is a packet of electromagnetic energy called?

One of your friends argues that he has read in the previous chapters that there can be no electric field inside a conductor. And hence there can be no current through it. What is the fallacy of this argument?

How is a sample of an n-type semiconductor electrically neutral though it has an excess of negative charge carriers?

A concave lens of refractive index 1.5 is immersed in a medium of refractive index 1.65. What is the nature of the lens?

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

What is the effect on specific conductance of any electrolyte with increase in temperature?

Would you prefer a voltmeter or a potentiometer to measure the emf of a battery?

Do electromagnetic waves carry energy and momentum?

Write the definition of SI unit of capacitance.