A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV
What is the threshold frequency for photoelectron production? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 6.8 × 1014 Hz
B) 2.7 × 1014 Hz
C) 7.6 × 1014 Hz
D) 8.5 × 1014 Hz
E) 9.4 × 1014 Hz
A
You might also like to view...
The peak of the quasar epoch was:
A) when there was still enough dark matter to fuel the supermassive black holes in their bar. B) when there was still sufficient mass to fuel the supermassive black holes at their center. C) before the formation of galaxies. D) before the star formation epoch. E) before mass had a chance to accumulate at the nucleus.
Reports are that singer Caruso was able to shatter a crystal chandelier with his voice, which illustrates
A) an echo. B) sound refraction. C) beats. D) resonance. E) interference.
The buoyant force of the atmosphere on a body is equal to the
A) weight of air displaced. B) volume of air displaced. C) mass of the air displaced. D) all of the above E) none of the above
About how hot does something have to get to glow red hot?
a. 375 degrees F c. 3000 K b. 800 degrees F d. 6000 K