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ISC Class 12 Physics Solved Question Paper 2016

Short Answer Type

11.

To which regions of the EM spectrum do the following wavelengths belong:

a) 250 nm
b) 1500 nm

12.

What is the difference between polarised light and unpolarized light?

13.

Name the principle on the basis of which optical fibres work?

14.

Calculate dispersive power of a transparent material given by:

n_v = 1.56, n_r = 1.54, n_y= 1.55

15.

What is meant by short-sightedness?

16.

Two metals A and B have work functions 4 eV and 6 eV respectively. Which metal has lower threshold wavelength for photoelectric effect.

17.
Calculate angular momentum of an electron in the third Bohr orbit of hydrogen atom.

Angular momentum of an electron in the third Bohr orbit, i.e., n = 3.

We know,

Angular momentum (mvr) = $straight n. space fraction numerator straight h over denominator 2 straight pi end fraction$
= 3 x $fraction numerator 6.63 space straight x space 10 to the power of negative 34 end exponent over denominator 2 space straight x space 3.14 end fraction$
= $fraction numerator 19.89 over denominator 6.28 end fraction x 10 to the power of negative 34 end exponent$
= 3.167 x 10^-34 kg m²/s