A. exposed to weak light.
B. cooled rapidly.
C. bombarded by high-speed electrons.
D.subjected to a small voltage.
2006-07-10 09:00:20 · 7 answers · asked by Andrea 3 in Science & Mathematics ➔ Physics
Well, I have personally used both A and C (provided the light frequency takes it above the work function of the condutor).
D could also work - a good conductor subject to a small voltage will carry a very large current. For instance, a flashlightg bulb filament is hot enough to emit electrons.
B is a no go.
2006-07-10 09:44:03 · answer #1 · answered by Epidavros 4 · 2⤊ 0⤋
A is right a weak light can emmit electrons as in photo electric effect D is wrong as a small voltage can't emmit electrons you need a good amount of voltage
2006-07-10 09:15:54 · answer #2 · answered by akash_dun 2 · 0⤊ 1⤋
A is right as well, depending on what "weak" light means. But the photoelectric effect is when you bombard a conductor with photons of the correct frequency, electrons can be ejected.
2006-07-10 09:08:43 · answer #3 · answered by Anonymous · 0⤊ 1⤋
A maybe, if the light frequency is high enough; B definitely not; C probably (it's called secondary emission and is used in photomultipliers), and D only if the resistance of the wire is low enough so that the wire is heated by the current, then electrons can be emitted through thermal emission (like the filaments in old-fashioned vacuum tube or in cathode ray tubes).
2006-07-10 19:47:39 · answer #4 · answered by gp4rts 7 · 0⤊ 1⤋
A is probably the correct answer, because the intensity of the light is unimportant, what matters is the wavelength.
D. is wrong because it causes electrons to flow, but it doesnt expel them.
2006-07-10 09:39:09 · answer #5 · answered by Alex 1 · 0⤊ 1⤋
D.subjected to a small voltage
2006-07-10 09:03:37 · answer #6 · answered by Anonymous · 0⤊ 1⤋
c is right, just took the test !
2015-08-10 10:55:16 · answer #7 · answered by Taylor 1 · 3⤊ 0⤋