What quantities are generally measured in photometry?

Discuss in detail different types of errors arising in the measurement of the physical quantities. State the general method for estimating the error in a combined caldculation.

What do you mean by nuclear reaction? What quantities are conserved in nuclear reaction? What is Q-value of nuclear reaction?

What is a measure ?

What is the largest unit to measure mass ?

What are vector quantities?

What are scalar quantities?

What is generator.