General Science Nuclear Science

Atom consists of nucleus and electrons. Protons and neutrons are present inside the nucleus.

1 angstrom = 1.0 x 10^-10 meters

*leptons are the lighter particles which can participate in week interaction ex-electrons, *baryons are the particles which can participate in both week n strong interactions ex-proton n neutrons. Mesons belong to baryons ex-sigma particles.

∴ Decreasing Order : Baryons, Mesons, Leptons

Graphite is used as moderator in nuclear reactor because it slow downs the fast moving electrons which are coming from fission reaction.

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Gamma rays are electrically neutral, which has low ionization power and as high penetrating power.

Colours are VIBGYOR [violet, indigo, blue, green, yellow, orange and red].

U-235 can under go fission with both slow and fast neutrons hence it is capable of sustaining chain reaction.

When the rays are passing through the centre of the gold plate they are almost reflected back with an angle of 180 degrees with incident ray whereas other rays which are passing far away from centre are refracted.

----------->-----|->----
--<------>-------|nucleus
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