The real image of an object is located 18.8 cm away from a concave mirror, which has a focal length of 8.20 cm. How far is the object from the mirror?
a. 10.6 cm
b. 16.4 cm
c. 6.88 cm
d. 14.5 cm
e. 18.8 cm
d
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Photoelectric Effect: A blue laser beam is incident on a metallic surface, causing electrons to be ejected from the metal. If the frequency of the laser beam is increased while the intensity of the beam is held fixed,
A. the rate of ejected electrons will decrease and their maximum kinetic energy will increase. B. the rate of ejected electrons will remain the same but their maximum kinetic energy will increase. C. the rate of ejected electrons will increase and their maximum kinetic energy will increase. D. the rate of ejected electrons will remain the same but their maximum kinetic energy will decrease.
Five motion diagrams in which points represent the positions of an object at equal time intervals are shown below. Which statement is correct?
?
a.
A has the greatest speed and the greatest acceleration.
b.
C has decreasing speed.
c.
D slows down and then speeds up.
d.
D speeds up and then slows down.
e.
E has a greater speed than A.
What is the primary source of erosion on the Moon? Why does change there take so long?
What will be an ideal response?
The amount of current in a circuit depends on _______.
A. the electrical resistance of the circuit B. the voltage across the circuit C. both of these answers D. neither of these answers