3.Alternating current flowing through a certain electrical device leads over the potential difference across it by 90° State whether this device is a resistor, capacitor or an inductor.
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4.What is the shape of the wavefront diverging from a point source of light?
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5.The critical angle for a given transparent medium and air is ic. A ray of light travelling in air is incident on this transparent medium at an angle of incidence equal to the polarising angle ip What is the relation between the two angles ic and ip?
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6.What are the dark lines seen in the solar spectrum called?
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7.Given an example where energy is converted into matter
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8.To convert a pure semiconductor into n-type semiconductor, what type of impurity is added to it?
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9.
Choose the correct alternative (a), (b), (c) or (d):
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