The principle of operation of a Geiger counter is:
a. Radiation strikes the metal coating of the Geiger tube, causing a clicking sound on impact that is amplified.
b. Radiation ionizes a gas and triggers an avalanche effect of ion generation that allows a current to flow.
c. Radiation is bounced back and forth from the sides of the Geiger tube, producing a signal each time it strikes the walls.
d. Radiation strikes fluorescent material coating the insides of the tube, and a photoelectric cell detects the flashes of light that result.
e. Radiation produces a visible track inside the Geiger tube, which is detected by a photocell.
b
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You could more easily resolve a close double star with a blue filter than with a red one
Indicate whether the statement is true or false
One of the most important physical properties of ceramics is their high ______________temperature.
Fill in the blank(s) with the appropriate word(s).
The average power input to a series alternating current circuit is minimum when
a. there are only a resistor and capacitor in the circuit. b. there are only a resistor and inductor in the circuit. c. there is only a resistor in the circuit. d. XL = XC and the circuit contains a resistor, an inductor and a capacitor. e. there is only a capacitor in the circuit.
Starting outside the region with the magnetic field, a single square coil of wire enters, moves across, and then leaves the region with a uniform magnetic field
perpendicular to the page so that the graph shown below represents the induced emf. The loop moves at constant velocity 
. As seen from above, a counterclockwise emf is regarded as positive. In which direction did the loop move over the plane of the page?
?
?
a.
The loop moved from bottom to top.
b.
The loop moved from top to bottom.
c.
The loop moved from left to right.
d.
The loop moved from right to left.
e.
All of these directions of motion will produce the graph of emf vs t.