Nuclei — Physics STD 12 Science — Question

Assertion  :   In Hertz experiment, the electric vector of radiation produced by the source gap is parallel to the gap.
Reason      : Production of sparks between the detector gap is maximum when it is placed perpendicular to the source gap. (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 the assertion and reason both are false.

When a ray of light emerges from a block of glass, the critical angle is(a) Equal to the angle of reflection(b) The angle between the refracted ray and the normal(c) The angle of incidence for which the refracted ray travels along the glass-air boundary(d) The angle of incidence

Rutherford’s a-particle experiment showed that the atoms have:

To reduce the value of capacitance of a parallel plate capacitor, the empty space between the plates:

Assuming photoemission to take place, the factor by which the maximum velocity of the emitted photoelectrons changes when the wavelength of the incident radiation is increased four times, is

Lenz's law is a direct consequence of:

In white light interference, nearest to the central (bright) fringe, will have which of the following colour:

Two equal positive charges are kept at points A and B. The electric potential at the points between A and B (excluding these points) is studied while moving from A to B. The potential.