Physics
What is a neuron ?

Basic unit of energy
Basic unit of nervous system
Particle released during radioactivity
The anti-particle of neutron

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Physics
In total internal reflection, the light travel from

Denser to rarer medium and it occurs with loss of intensity
Denser to rarer medium and it occurs with no loss of intensity
Rarer to denser medium and it occurs with no loss of intensity
Rarer to denser medium and it occurs with loss of intensity

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