When a metal is illuminated by light, photoelectrons are observed provided that the wavelength of the light is less than 520 nm. What is the metal's work function? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 2.4 eV
B) 2.6 eV
C) 2.8 eV
D) 3.0 eV
A
You might also like to view...
Which of the following are not found on Venus?
a. volcanoes b. coronae c. rolling plains d. lobate scarps e. high atmospheric pressure
A resistor is made out of a long wire having a length L. Each end of the wire is attached to a terminal of a battery providing a constant voltage V0
A current I flows through the wire. If the wire were cut in half, making two wires of length L/2, and both wires were attached to the battery (the end of both wires attached to one terminal, and the other ends attached to the other terminal), what would be the total current flowing through the two wires? A) 4I B) 2I C) I D) I/2 E) I/4
A simple pendulum and a mass oscillating on an ideal spring both have period T in an elevator at rest. If the elevator now moves downward at a uniform 2 m/s, 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.
An alternative to the core-accretion theory that explains the formation of the jovian planets is the:
A) differentiation theory. B) collision theory. C) gravitational instability theory. D) Big Bang theory. E) nebular contraction theory.