What is H-spectrum ?

What is a pure spectrum?

What is electromagnetic spectrum? To what uses it is put to?

What is the nature of spectrum of moonlight?

What is electromagnetic spectrum? Give its four uses.

The first member of Balmer series in hydrogen spectrum has a wavelength of 6563overset@A .What will be the wavelength of Lyman series in the same spectrum ?

In the figure given below , the black line(upper) indicates action spectrum for photosynthesis and the lighter line (lower) indicates the absorption spectrum of chlorophyll 'a' , answer the followings: Wavelength of light nanometera(nm) What does the action spectrum indicate? how can we plot an action spectrum? explain with an example.