A certain metallic surface is illuminated withmonochromatic light of wavelength, l. The stoppingpotential for photo-electric current for this light is3V0. if the same surface is illuminated with light ofwavelength 2λ, the stopping potential is V0. Thethreshold wavelength for this surface for photoelectriceffect is :-
A Carnot engine, having an efficiency of n = 1/10 asheat engine, is used as a refrigerator. If the workdone on the system is 10 J, the amount of energyabsorbed from the reservoir at lower temperature is
Which logic gate is represented by the followingcombination of logic gates ?
The refracting angle of a prism is A, and refractiveindex of the material of the prism is cot(A/2). Theangle of minimum deviation is :-
The fundamental frequency of a closed organ pipeof length 20 cm is equal to the second overtone ofan organ pipe open at both the ends. The lengthof organ pipe open at both the ends is :-
A parallel plate air capacitor of capacitance C isconnected to a cell of emf V and then disconnectedfrom it. A dielectric slab of dielectric constant K,which can just fill the air gap of the capacitor, is nowinserted in it. Which of the following is incorrect