Physics
Which one among the following doesn't have any effect on velocity of sound ?

Temperature
Pressure
Density
Humidity

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Physics
Which one of the following is the correct sequence of passage of light in a compound microscope?

Condenser -Objective lens -Body tube -Eyepiece
Eyepiece -Objective lens -Body tube -Mirror
Condenser -Objective lens -Eye -piece -Body tube
Objective lens -Condenser -Body tube -Eye piece

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