The frequency of light ray having the wavelength 3000 Å is [DPMT 20 – McqOptions

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1.	The frequency of light ray having the wavelength 3000 Å is [DPMT 2002]
A.	9 ´ 1013 cycles/sec
B.	1015 cycles/sec
C.	90 cycles/sec
D.	3000 cycles/sec
Answer» C. 90 cycles/sec

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