Draw a labelled energy band diagram for a solid which is an insu
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    Subject
    Physics

    Class

    ICSE Class 12

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    ISC Class 12 Physics Solved Question Paper 2012

    Multiple Choice QuestionsShort Answer Type

    41. Energy levels of H atom are given by:

    En  = negative fraction numerator 13.6 over denominator straight n squared end fraction space eV where n is Principal Quantum number. Calculate the wavelength of electromagnetic radiation emitted by hydrogen atom resulting from the transition: n = 2 to n = 1.
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    42.

    i) What is Compton effect ?

    (ii) In Coolidge X-Ray tube (Modern X-Ray tube) how will you vary:

    (1) intensity of emitted X-Rays?

    (2) penetrating power of emitted X-Rays?

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    43. Complete the following table for a radioactive element whose half life is 5 minutes. Assume that you have 32 g of this element at start, i.e. at t = 0.


    Now, using this data, plot the “decay curve”.


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    44. Calculate the energy released when an electron annihilates a positron.
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    45. Draw a labelled energy band diagram for a solid which is an insulator. What is the main difference between this diagram and that of a semiconductor?

    Insulator Example - diamond



    Difference between insulator and semiconductor is that the forbidden energy gap is 1.1 eV in case of semiconductor (silicon), whereas forbidden energy gap of insulator is very i.e. 7 eV (diamond).
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    46. Figure below shows the circuit of an electronic device:

    (i) Which electronic device: a rectifier, an amplifier or an oscillator does the above circuit represent?

    (ii) State where the input voltage is applied and where the output voltage is available.

    (iii) Compare the output voltage of this circuit with its input voltage.

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    47. Prepare a truth table for the combination of gates shown in Figure 8 below: 
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