SELECT * FROM question_mgmt as q WHERE id=1298 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=43 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

Lifetimes of the molecules in the excited states are often measured by using pulsed radiation source of duration nearly in the nano second range. If the radiation source has the duration of 2 ns and the number of photons emitted during the pulse source is 2.5 × 1015, calculate the energy of the source.

Answer:

Frequency = 1/2.x10-9 = 0.5x109 / sec

Energy = Nhv = (2.5x105)(6.626x10-34)(0.5x109)

= 8.28x10-10J


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