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

An equipotential surface is that surface:

Photoelectric emmision occurs only when the incident light has more than a certain minimum?

A 5 ℃ rise in the temperature is observed in a conductor by passing some current. When the current is doubled, then rise in temperature will be equal to

(a) 5 ℃

(b) 10 ℃

(c) 20 ℃

(d) 40 ℃

The total charge of the electric dipole is:

The equivalent resistance of resistors connected in series is always

(a) Equal to the mean of component resistors

(b) Less than the lowest of component resistors

(c) In between the lowest and the highest of component resistors

(d) Equal to sum of component resistors

Assertion : According to classical theory, the proposed path of an electron in Rutherford atom model will be parabolic.

Reason     : According to electromagnetic theory an accelerated particle continuously emits radiation.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If assertion is false but reason is true.

State the rule that is used to find the direction of field acting at a point near a current-carrying straight conductor.

Minimum deviation is observed with a prism having angle of prism A, angle of deviation δ, angle of incidence i and angle of emergence e. We then have generally

(a) i > e

(b) i < e

(c) i = e

(d) i = e = δ

In Heinrich Hertz’s experiment on the production of electromagnetic waves by means of spark discharge, it was observed that high voltage sparks across the detector loop were _____ when the emitter plate was illuminated by _____ light?

 and  represents gravitational and electrostatic force respectively between electrons situated at a distance 10 cm. The ratio of  is of the order of

(a)

(b) 10

(c) 1

(d)