A metal has a work function of 4.50 eV. Find the maximum kinetic energy of the photoelectrons if light of wavelength 250 nm shines on the metal
(1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 0.00 eV
B) 0.37 eV
C) 0.47 eV
D) 0.53 eV
C
You might also like to view...
The atmosphere of Titan is chiefly
A) ammonia. B) nitrogen. C) oxygen. D) methane. E) hydrogen.
The technique for producing single crystals of turbine blades is by a modification of
(a) Investment casting (b) Directional solidification (c) The Bridgeman-Stockbarger technique (d) The Czochralski technique
A resistor of unknown resistance and a 15-? resistor are connected across a 20-V emf in such a way that a 2.0 A current is observed in the emf. What is the value of the unknown resistance?
a. 75 ? b. 12 ? c. 7.5 ? d. 30 ? e. 5.0 ?
____ are crucial in determining the distance to objects that are far away, but still in the Milky Way galaxy
a. RR Lyrae stars b. Cepheid variable stars c. O and B stars d. Emission nebulae e. Supernovae