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The frequency of an electromagnetic radiation is 2x 106 Hz. . What is its wavelength in metres : (Velocity of light = 3x108 ms-1)
(1)6.0x 1014
(2)1.5x 104
(3)1.5x 102
(4)0.66x 10-2
Ans:1.5x 102
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Aufbau principle is obeyed in which of the following electronic configurations: (1) 1s 2 2s 2 2p 6 (2) 1s 2 3p 6 3s 2 (3) 1s 2 3s 2 3p 6
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