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Question

An alternating current having peak value 28 A is used to heat a metal wire. To produce the same heating effect, a constant current i can be used where i is 

Easy
Solution

idc=irms=ipeak2=282=20Aapprox



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In a sample of ions, a Li++ ion electron in first Bohr orbit is excited to a level by a radiation of wavelength λ. When the ion gets de-excited to the ground state in all possible ways (including intermediate emissions), a total of six spectral lines are observed. What is the value of λ ?

 (Given, h=6.63×1034Js,c=3×108ms1


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