## Dual nature of light and related questions

How light has a dual nature?

A photon has zero rest mass. Explain how ?

(These questions were posted by Shubham SInha  and Ritika Chatak)

The dual nature of light has been established through

TWIN PARADOX is a paradoxical situation coming in while explaining the theory of relativity. “Time dilation” is one of the important consequences of relativity. It says that if a body is moving with relativistic speeds, time will dialate ...

## Is the acceleration due to gravity different in south pole and north pole

Mohak Tandon Asks – “ “Is the acceleration due to gravity different in south pole and north pole?” Answer: As per theory, acceleration due to gravity changes with altitude, depth and latitude. If we consider that the variation of g with latitude is caused by rotation of earth only, then the value of g will be same for both [...]

## Why Rainbow is in the form of an arc?

Why is a rainbow always bent in the shape of a semi circle…?? but according to the theory light travels straight….!!! (Ramesh asked)

## A question based on the theory of machines

†ђe fig below shows a tilt hammer ahinged at o, with its head resting on top of †ђe pile Bm †ђe hammer including †ђe arm OA, has a mass of 25kg.its centre of gravity Gis 400mm horizontally. from O Ąπϑ its radius of gyration about an axis through G parallel to †ђe axis of †ђe [...]

## CBSE Rules for Improvement of Performance

Improvement of Performance  Senior School Certificate Examination **(i) A candidate who has passed an examination of the Board may reappear for improvement of performance in one or more subject(s) in the main examination in the succeeding year only; however, a candidate who has passed an examination of the Board under Vocational Scheme may reappear for [...]

## CBSE Rules for Compartment Examinations

Compartment Examination for Secondary/Senior School Certificate Examination ** (i) A candidate placed in compartment may reappear at the compartmental examination to be held in July/August and may avail himself/herself of the second chance in March/April next year and may further avail himself/herself of the third chance at the compartmental examinations to be held in July/August [...]