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Sahay Sir > Question Answers > JEE Mains Physics 2002-2019 Solved Video Solutions > Practice Set 1 > A beam of plane polarised light of large cross-sectional area and uniform intensity of 3.3 Wm^–2 falls normally on a polariser (cross sectional area 3 × 10^–4 m^2) which rotates about its axis with an angular speed of 31.4 rad/s. The energy of light passing through the polariser per revolution, is close to

A beam of plane polarised light of large cross-sectional area and uniform intensity of 3.3 Wm^–2 falls normally on a polariser (cross sectional area 3 × 10^–4 m^2) which rotates about its axis with an angular speed of 31.4 rad/s. The energy of light passing through the polariser per revolution, is close to

A balloon filled with helium (32°C and 1.7 atm.) bursts. Immediately afterwards the expansion of helium can be considered as