Photoelectric Effect: The work function of a particular metal is 4.20 × 10-19 J. What is the photoelectric cutoff (threshold) wavelength for this metal? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 473 nm
B. 308 nm
C. 393 nm
D. 554 nm
Answer: A
You might also like to view...
High-mass stars evolve differently than medium-mass stars because they are able to fuse _______________
Fill in the blank(s) with correct word
Suppose that Earth's spin would suddenly reverse direction, but the direction of Earth's motion around the Sun was preserved. Which of the following changes would you expect to observe?
A. The stars would rise in the west and set in the east. B. The planets would rise in the west and set in the east. C. The Sun would rise in the west and set in the east. D. All of these would be observed. E. None of these choices is correct.
An ideal heat engine can have an efficiency of 1 if the temperature of the low temperature reservoir is
a. 0 K. b. 0°C. c. 0°F. d. 0°R. e. the same as the temperature of the heat source.
Sort each statement below into the appropriate bin based on whether it is something that scientists knew about Pluto or its moon Charon before the New Horizons flyby, is something learned as a result of the New Horizons flyby, or is something that seems possible from the New Horizons mission but for which we'll need additional data to establish it with certainty.
What will be an ideal response?