The collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate . Light source is put on and a saturation photo current is recorded . An electric field is switched on which has a vertically downward direction . Then A. the photocurrent will increaseB. the K.E. of the electrons will increaseC. the stopping potential will decreaseD. the threshold wavelength will increase

The collector plate in an experiment on photoelectric effect is kept v

1.	The collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate . Light source is put on and a saturation photo current is recorded . An electric field is switched on which has a vertically downward direction . Then A. the photocurrent will increaseB. the K.E. of the electrons will increaseC. the stopping potential will decreaseD. the threshold wavelength will increase
Answer» Correct Answer - B Electric force on electrons will increase velocity

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Light of intensity l is incident perpendicularly on a perfectly reflecting plate of area A kept in a gravity free space. If the photons strike the plate symmetrically and initially the springs were at natural lengths, what is the maximum compression A. `(IA)/(Kc)`B. `(2Ia)/(3Kc)`C. `(3Ia)/(Kc)`D. `(4Ia)/(3Kc)`
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A. How many photons of a tradiation of wavelength `lamda=5xx10^(-7)` m must fall per second on a blackened plate in order to produce a force of `6.62xx10^(-5)`N? B. At what rate will the temperature of plate rise if its mass is 19.86kg and specific heat is equal to `2500J(kgK^(-1))`?
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