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ISC Class 12 Physics Solved Question Paper 2012

Short Answer Type

11. Which electromagnetic radiation has wavelength greater than that of X rays and smaller than that of visible light?

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12. How did Fresnel construct a biprism in order to study interference of light?

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13. State Brewster’s law of polarisation of light.

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14. A thin convex lens (L₁) of focal length 80 cm and a thin concave lens (L₂) of focal length f are kept co-axially, 20 cm apart as shown in figure 3 below. When a narrow and parallel beam of light is incident on the convex lens, bean emerging fron the concave lens is also a parallel beam. Find f.

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15. What condition must be satisfied by two thin lenses kept in contact so that they form an achromatic doublet, i.e. a combination free from chromatic aberration ?

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16. Threshold frequency of a certain metal for photo-electric emission is 5x10¹⁴Hz. Calculate its work function.

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17. What conclusion was drawn by Rutherford based on Geiger-Marsden’s experiment on scattering of alpha particles?

Conclusion drawn by Rutherford is that an atom has a lot of empty space in it. The whole of the positive charge and nearly entire mass of the atom were concentrated in a tiny central core called nucleus.

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