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ISC Class 12 Physics Solved Question Paper 2010

Short Answer Type

11. Which electromagnetic wave is longer than X-ray but shorter than light wave?

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12. Calculate the critical angle for glass and water pair.

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13. Name an optical device, which when used with a spectrometer, can determine the wavelength of the given monochromatic light.

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14.

Young’s double slit experiment was performed with monochromatic light of blue colour. The experiment was then repeated, first with light of red colour and then with light of yellow colour. Which colour produces interference pattern with maximum fringe separation (i.e., fringe width)?

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15.

Calculate dispersive power of glass, accurately up to decimal places, from the following data:

Refractive index of glass for red colour = 1.60

Refractive index of glass for yellow colour =1.61

Refractive index of glass for violet colour = 1.62

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16. De Broglie wavelength of electrons of kinetic energy E is λ. What will be its value if kinetic energy of electrons is made 4E?

De Broglie’s wavelength of electron = λ

Let the new wavelength be λ₂

K.E. of electrons = E

$straight lambda over straight lambda subscript 2 space equals space fraction numerator square root of E over denominator square root of 4 E end root end fraction s i n c e space lambda space equals space fraction numerator h over denominator square root of 2 m E end root end fraction straight lambda over straight lambda subscript 2 space equals space 1 half space straight lambda subscript 2 space equals space 2 space straight lambda$