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

Does the magnifying power of a microscope depend on the colour of the light used? Justify your answer.

Is the ratio of frequencies of ultraviolet rays and infrared rays in glass more than, less than or equal to 1?

Is it possible for a current loop to stay without rotating in a uniform magnetic field? If yes, what should be the orientation of the loop?

Why do the electric field lines never cross each other?

An illuminated object is placed on the principal axis of a converging lens so that a real image is formed on the other side of the lens. If the object is shifted a little,

1. The image will be shifted simultaneously with the object.
2. The image will be shifted a little later than the object.
3. The image will be shifted a little earlier than the object.
4. The image will not shift.

What is the process of spontaneous disintegration of an element called?

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

What percentage of a given mass of a radioactive substance will be left undecayed after four half periods?

What is called optical instrument?

Two circular loops are placed with their centres separated by a fixed distance. How would you orient the loops to have:

1. The largest mutual inductance.
2. The smallest mutual inductance?