Physics

ICSE Class 12

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12.
Why all over the world, giant telescopes are of reflecting type? State any one reason.

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13.
A ray of ordinary light is incident on a rectangular block of glass at Brewster’s angle. What is the angle between the reflected ray and the refracted ray of light?

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Half life period is 8 hours

N_{0} = 32 gm

After 8 hours it will remain 1/2 of N_{o}

After 16 hours, it will remain 1/4 of N_{o}

After 24 hours it will remain 1/8 of N_{o}

So, 32/8 = 4 gm of element will be remain after one day.

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16.
If a hydrogen atom goes from III excited state to II excited state, what kind of radiation (visible light, ultra violet, infra red, etc.) is emitted?

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18.
In which of the solids (semi-conductors, conductors or insulators) do conduction band and valence band overlap?

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