Physics
A balloon filled with hydrogen will

Reach a particular height and remain floating
Burst after reaching some height
Continue going upwards uninterrupted
Reach a particular height and start coming down

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Physics
In total internal reflection, the light travel from

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
Denser to rarer medium and it occurs with loss of intensity

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