2n 1, where 'n' is less integer among both integers.

do uses for simple present tense did

same in array but structures can have different

different in array not in structure

in one way intensity is amount While frequency is quentity. As amout can change but frequency can't change directly.You should Know photoelectric effect where as intencity changes amount of ejected electron increases While wavelength changes frequency changes.frequency & intensity are different terms.