Which of the following statements is TRUE of photoelectric effect?
it cannot occur in liquids
the energy of the emitted electrons is independent of the work function of the surface
the energy of the emitted electron depends on the wavelength of the incident light
the greater the intensity of the incuident light, the greater the incident of the emitted electron
Correct answer is C
The photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material.
The frequency of the incident light on the substance determines the kinetic energy of the emitted electrons.
The number of electrons emitted and the intensity of light incident are proportional to each other.
What type of reaction is represented by the following scheme? 21X + 21Y + 32Z + 10n + energy
Fusion reaction
Fission reaction
Chain reaction
Radioactive decay
Correct answer is A
No explanation has been provided for this answer.
2.00Ω
2.22Ω
18.00Ω
18.22Ω
Correct answer is B
110I x 20 = 910I x Rs
Rs = 2.22Ω
When two parallel wires carry currents in opposite directions, the force on either wire is
away from the other wire
zero, because the currents cancel each other
twice as much as when the currents are in the same direction
towards the other wire
Correct answer is A
No explanation has been provided for this answer.
The direction of the magnetic field at a point in the vicinity of a bar magnet is
always towards the north pole of the magnet
always away from the south pole of the magnet
along the line joining the point to the neutral point
in the direction the north pole of a compass needle would point
Correct answer is D
No explanation has been provided for this answer.