At 0 K temperature, a p-type semiconductor
does not have any charge carriers
has few holes but no free electrons
has few holes and few free electrons
has equal number of holes and free electrons
The speed of an electron having a wavelength of 10-10 m is
7.25 × 106 m/s
5.25 × 106 m/s
6.26 × 106 m/s
4.24 × 106 m/s
Brilliance of diamond is due to
shape
reflection
cutting
total internal reflection
D.
total internal reflection
Total internal reflection can occur only when a ray is incident on the surface of a medium whose refractive index is smaller than that of the medium in which the ray is travelling. Since the refractive index of air is 1.00029 and that of a diamond is 2.42, therefore brilliance of diamond is due to total internal reflection.
The Cauchy's dispersion formula is
n = A + Bλ-2 + Cλ-4
n = A + Bλ-2 + Cλ4
n = A + Bλ2 + Cλ-4
n = A + Bλ2 + Cλ4
Assertion: Coloured spectrum is seen when we look through a muslin cloth.
Reason: It is due to the diffraction of white light on passing through fine slits
If both the assertion and reason are true and reason is a correct explanation of the assertion
If both assertion and reason are true but assertion is not a correct explanation of the assertion.
If the assertion is true but the reason is false.
If both assertion and reason are false.
Assertion: When tiny circular obstacle is placed in the path of light from some distance, a bright spot is seen at the centre of the shadow of the obstacle.
Reason: Destructive interference occurs at the centre of the shadow.
If both the assertion and reason are true and reason is a correct explanation of the assertion.
If both assertion and reason are true but assertion is not a correct explanation of the assertion.
If the assertion is true but the reason is false
If both assertion and reason are false.
Assertion: Quasar emits radiowaves more than radio galaxy.
Reason: Quasar has very small size
If both the assertion and reason are true and reason is a correct explanation of the assertion.
If both assertion and reason are true but assertion is not a correct explanation of the assertion.
If the assertion is true but the reason is false.
If both assertion and reason are false.
Assertion: S.I. units are logical and coherent.
Reason: S.l. system of units is a rationalised system.
If both the assertion and reason are true and reason is a correct explanation of the assertion.
If both assertion and reason are true but assertion is not a correct explanation of the assertion.
If the assertion is true but the reason is false.
If both assertion and reason are false.