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Physics
Hydrogen atom in its ground state is excited by means of monochromatic radiation of wavelength 975 . How many different lines are possible in the resulting spectrum? Calculate the longest wavelength amongst them. You may assume the ionization energy for hydrogen atom as 13.6 eV.
Chemistry
For the reaction, 2CO + O₂ 2CO₂; H = -560kJ. Two moles of CO and one mole of O₂ are taken in a container of volume 1 L. They completely form two moles of CO₂, the gases deviate appreciably from ideal behaviour. If the pressure in the vessel changes from 70 to 40 atm, find the magnitude (absolute value) of U at 500 K. (1 L atm = 0.1 kJ)
Mathematics
A and B are two independent events. C is event in which exactly one of A or B occurs. Prove that