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 increase and their maximum kinetic energy will increase.
B) the rate of ejected electrons will remain the same but their maximum kinetic energy will decrease.
C) the rate of ejected electrons will remain the same but their maximum kinetic energy will increase.
D) the rate of ejected electrons will decrease and their maximum kinetic energy will increase.
D
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To rotate a stubborn screw, it is best to use a screwdriver that has a
A) wide handle. B) long handle. C) smooth handle. D) none of the above
A rubber ball and a lump of putty have equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall
Which objects experiences the greater momentum change? A) the ball B) the putty C) Both experience the same non-zero momentum change. D) Both experience zero momentum change. E) Cannot be determined from the information given.
A 0.75-kg sphere is released from rest and is moving 5.0 m/s after falling 2.0 m in a viscous medium. What is the change in mechanical energy caused by the force the viscous medium exerts on the sphere during this descent?
a. -6.1 J b. -4.6 J c. -5.3 J d. -6.8 J e. -2.7 J
The metal detectors that people walk through at airports operate via
A) Ohm's law. B) Faraday's law. C) Coulomb's law. D) Newton's laws. E) civil laws.