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QUESTION:

The linewidth of a green light (lambda= 500nm) is DELTA-lambda=2.5 X 10^(-3) nm, what is the frequency bandwidth DELTA-nu?

a) 3X10^8 Hz

b) 3X10^9 Hz

c) 3X10^6 Hz

d) 3X10^-8 Hz

e) none o the above

SOLUTION:

i have the forumla....DELTA-nu= (-c / lambda)*DELTA-lambda....my prof gave us this forumula to use on the last day of class when we were going over these problems. but when i use it i dont get one of the answers listed. i know theres an option E, but he virtually never uses that. and also my answer is 1500 which is off by a factor of 2 X 10^x....i found that odd. and lastly when you compute the units of the above mentioned forumla you end up with m/s...shouldnt the units be in 1/s? i must have this formula wrong.