Electrostatics — Physics STD 12 Science — Question

Can you add two vectors representing physical quantities having different dimensions? Can you multiply two vectors representing physical quantities having different dimensions?

(a) When monochromatic light is incident on a surface separating two media, the reflected and refracted light both have the same frequency as the incident frequency. Explain why?
(b) When light travels from a rarer to a denser medium, the speed decreases. Does the reduction in speed imply a reduction in the energy carried by the light wave?
(c) In the wave picture of light, intensity of light is determined by the square of the amplitude of the wave. What determines the intensity of light in the photon picture of light.

Define the distance of closest approach.

A barometer correctly reads the atmospheric pressure as 76cm of mercury. Water droplets are slowly introduced into the barometer tube by a dropper. The height of the mercury column first decreases and then becomes constant. lf the saturation vapour pressure at the atmospheric temperature is 0.80cm of mercury, find the height of the mercury column when it reaches its minimum value.

Calculate the potential energy of a single charge in an external field.

Why are elemental dopants for Silicon or Germanium usually chosen from group XIII or group XV?

In a head-on collision between two particles, is it necessary that the particles will acquire a common velocity at least for one instant?