Physics
Pycnometer is an instrument used to measure the

Intensity of earthquake
High temperatures
Intensity of solar radiation
Density

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Physics
In total internal reflection, the light travel from

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

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