Find the minimum magnetic field needed for the Zeeman effect to be observed in a spectral line of 400 nm wavelength when a spectrometer whose resolution is 0.010 nm is used. Write the answer in the nearest high integer.

2Medium20 marks

An transistor with is used in common-emitter amplifier mode with and . If a resistor is connected between the collector and the base of the transistor, calculate the quiescent collector current. Assume .

3Medium15 marks

The quantum numbers of two electrons in a two valence electron atom are;

(i) Assuming coupling, find the possible value of and hence of .

(ii) Assuming coupling, find the possible values of .

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