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

A metallic bob A oscillates through the space between the poles of an electromagnet. The oscillations are more quickly damped when the circuit is on, as compared to the case when the circuit is off. Explain.

Answer the following question:
When a low flying aircraft passes overhead, we sometimes notice a slight shaking of the picture on our TV screen. Suggest a possible explanation.

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.

When a current is established in a wire, the free electrons drift in the direction opposite to the current. Does the number of free electrons in the wire continuously decrease?

What is the effect of core on self-induction?

State de-Broglie hypothesis.

In resistance box, the resistor wires that are used are joined by folding twice in the shape of the coil. Why?

Why does a diamond shine more than a glass piece cut to the same shape?

When the frequency of the AC source in an LCR circuit equals the resonant frequency, the reactance of the circuit is zero. Does it mean that there is no current through the inductor or the capacitor?