Figure below shows the circuit of an electronic device: (i) Whic

Subject

Physics

Class

ICSE Class 12

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 Multiple Choice QuestionsShort Answer Type

41. Energy levels of H atom are given by:

Enegative 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?
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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.


(i) Amplifier

(ii) Input voltage is applied across AB, output voltage is obtained across the road.

(iii) Output voltage = 50 x input voltage

That is, input voltage is 50 times the output voltage. 

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


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