A metal having a work function of 2.4 eV is illuminated with monochromatic light whose photon energy is 4.0 eV
What is the maximum kinetic energy of the photoelectrons produced by this light? (h = 6.626 × 10-34 J • s, 1 eV = 1.60 × 10-19 J)
A) 2.6 × 10-19 J
B) 4.7 × 10-19 J
C) 3.8 × 10-19 J
D) 5.5 × 10-19 J
E) 6.4 × 10-19 J
A
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Which of these will penetrate into lead?
A) alpha particle B) beta particle C) gamma ray. D) all of the above
A simple pendulum and a mass oscillating on an ideal spring both have period T in an elevator at rest. If the elevator now accelerates downward uniformly at 2 m/s2, what is true about the periods of these two systems?
A) Both periods would remain the same. B) Both periods would increase. C) Both periods would decrease. D) The period of the pendulum would increase but the period of the spring would stay the same. E) The period of the pendulum would decrease but the period of the spring would stay the same.
Three particles are placed in the xy plane. A 40-g particle is located at (3, 4) m, and a 50-g particle is positioned at (-2, -6) m. Where must a 20-g particle be placed so that the center of mass of this three-particle system is located at the origin?
a. (-1, -3) m b. (-1, 2) m c. (-1, 12) m d. (-1, 7) m e. (-1, 3) m
In radioactive decay, when the parent material decays to one-quarter of its original amount, the time is
A) one half-life. B) two half-lives. C) three half-lives. D) four half-lives.