An electron and a proton are moving at the same speed in circular paths in the same uniform magnetic field. The radius of the path of the proton is one of the following. Is this radius

Q-1: An electron and a proton are moving at the same speed in circular paths in the same uniform magnetic field. The radius of the path of the proton is one of the following. Is this radius:

1) the same as that of the electron
2) about 2000 times larger than that of the electron
3) a little larger than that of the electron
4) smaller than that of the electron
ANSWER: 2 -- ABOUT 2000 TIMES LARGER THAN THAT OF THE ELECTRON

Q-2: In the mass spectrograph, two positively charged ions having the same velocity pass through a slit and enter a uniform magnetic field at right angles to their initial velocities. The ions will NOT be separated if:

1) they have the same masses but different charges
2) they have the same charges but different masses
3) the products of their charges and their masses are equal
4) the ratios of their charges to their masses are equal
ANSWER: 4 -- THE RATIOS OF THEIR CHARGES TO THEIR MASSES ARE
EQUAL

Q-3:  A capacitor and a coil are connected in series. The capacitor is charged and allowed to discharge through the coil. The current that will then flow through the capacitor-coil combination will do one of the following things. Will it:

1) flow in one direction, beginning at a maximum and decreasing rapidly to zero
2) oscillate indefinitely
3) oscillate but diminish steadily to zero
4) oscillate at high frequency at first but then at slower frequency
ANSWER: 3 -- OSCILLATE BUT DIMINISH STEADILY TO ZERO

Q-4: The energy associated with one photon of a light beam is proportional to one of the following. Is it proportional to:

1) the intensity of the light source from which it came
2) the number of photons in the beam
3) the frequency of the photon
4) the speed of the photon
ANSWER: 3 -- THE FREQUENCY OF THE PHOTON

Q-5:  When a certain beam of light falls upon a metal surface, it ejects photoelectrons from it. The number of photoelectrons ejected per second by the beam of light depends upon one of the following. Is it proportional to:

1) the threshold frequency of the metal
2) the work function of the metal
3) the frequency of the beam
4) the intensity of the beam
ANSWER: 4 -- THE INTENSITY OF THE BEAM

Q-6:  In Rutherford's experiment involving the deflection of alpha particles by atomic nuclei, the fact that some of the alpha particles bombarding the thin gold foil were back-scattered, led to one of the following conclusions. It was concluded that:

1) the charge of an electron is negative
2) the nucleus of a gold atom carries all its charge
3) most of the mass of a gold atom is in its nucleus
4) the nucleus of a gold atom occupies nearly the entire space of the atom
ANSWER: 3 -- MOST OF THE MASS OF A GOLD ATOM IS IN ITS NUCLEUS

Q-7:  Standing waves are formed when two sets of waves of equal amplitude and frequency

1) are in phase
2) are in opposite phase
3) move through each other in opposite directions
4) are reflected from the same surface
ANSWER: 3 -- MOVE THROUGH EACH OTHER IN OPPOSITE DIRECTIONS

Q-6: The common-emitter transistor circuit can amplify a small current signal because a small change in the signal current produces one of the following. Does the change in signal produce a large change in the:

1) emitter-base voltage
2) base current
3) collector current
4) collector voltage
ANSWER: 3 -- COLLECTOR CURRENT