When you interchange your emitter for one with a smaller work function, you measure
C.
Any changes in stopping voltage would change the necessary energy to bridge the emitter-collector gap. Since a current i is already established, the electrons could already get across, and with a decreased work function, the photons are greater in energy. An increase in the necessary stopping voltage would mean that just the most energetic electrons will bridge the gap
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If it takes 7 N to stretch a spring 8 cm and if the spring is then cut in half, what force does it take to stretch one of the halves 4 cm?
a. 3.5 N b. 7 N c. 14 N d. 21 N e. 28 N
What force balances the sun’s gravity?
While an iron block near the Earth's surface is in free fall, it undergoes an increase in
A) speed. B) acceleration. C) both of these D) neither of these
Which statement about extrasolar planets found to date is true?
A) All are terrestrials, comparable in size to Earth. B) All lie more than 2 AU from their star. C) Most have orbital periods of more than a year. D) Some are so close to their stars that their periods are just a few days. E) Few are found by Doppler shifts of their stars, due to their gravity.