Science Bowl PHYSICS
Physics - 79
PHYS-92; Multiple Choice: 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:
w) the same as that of the electron
x) about 2000 times larger than that of the electron
y) a little larger than that of the electron
z) smaller than that of the electron
ANSWER: X -- ABOUT 2000 TIMES LARGER THAN THAT OF THE ELECTRON
PHYS-92; Multiple Choice: 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:
w) they have the same masses but different charges
x) they have the same charges but different masses
y) the products of their charges and their masses are equal
z) the ratios of their charges to their masses are equal
ANSWER: Z -- THE RATIOS OF THEIR CHARGES TO THEIR MASSES ARE
EQUAL
PHYS-92; Multiple Choice: 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:
w) flow in one direction, beginning at a maximum and decreasing rapidly to zero
x) oscillate indefinitely
y) oscillate but diminish steadily to zero
z) oscillate at high frequency at first but then at slower frequency
ANSWER: Y -- OSCILLATE BUT DIMINISH STEADILY TO ZERO
PHYS-92; Multiple Choice: The energy associated with one photon of a light beam is
proportional to one of the following. Is it proportional to:
w) the intensity of the light source from which it came
x) the number of photons in the beam
y) the frequency of the photon
z) the speed of the photon
ANSWER: Y -- THE FREQUENCY OF THE PHOTON