AIEEE Exam Category

Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4.Then the number of spectral lines in the emission spectra will be :
(1) 2
(2) 3
(3) 5
(4) 6

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AIEEE Other Question

A line is drawn through the point (1, 2) to meet the coordinate axes at P and Q such that it forms a triangleOPQ, where O is the origin. if the area of the triangle OPQ is least, then the slope of the line PQ is : A die is thrown again and again until three sixes are obtained. Find the probability of obtaining the third six in the sixth throw of the die