NDA Government Jobs Exams

Which one among the following transitions is associated with the largest change in energy in hydrogen atom
(A) n = 5 to n = 3 (B) n = 2 to n = 1
(C) n = 3 to n = 2 (D) n = 4 to n = 2

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NDA Other Question

An iron ball and a wooden ball of the same radius are released from a height 'H' in vacuum. The time taken to
reach the ground will be -
(A) more for the iron ball (B) more for the wooden ball
(C) equal for both (D) in the ratio of their weights
Which one among the following does not have an allotrope ?
(A) oxygen (B) Sulphur
(C) Nitrogen (D) Carbon