Photoelectric Effect: What is the longest wavelength of light that can cause photoelectron emission from a metal that has a work function of 2.20 eV? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 417 nm
B. 257 nm
C. 344 nm
D. 565 nm
E. 610 nm
Answer: D
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Which of the following is not one of the three major strategies used to measure the mass of a galaxy cluster?
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If we had never discovered quantum mechanics, which of the following would be true?
A) We would not have electronic devices such as cell phones and laptops. B) The physical world would behave much differently. C) Nothing would be different because quantum mechanics has not led to any changes in the lives of people. D) The Sun would not shine.
The latest observations of distant Type I supernovae suggest the universe is slowing down more than we had expected
Indicate whether the statement is true or false