Types of Sources

What is the root source of all types of rocks?

A monochromatic source emits light of wavelength 550 nm is emitted by a source . Find the number of photons emitted by the source in 90 seconds if power of source is 60 W.

What is a source of energy ? What are the two main categories of the sources of energy ?

What are the different types of pollution and their sources ? Write a note on Urban Waste Disposal.