Photoelectric Effect: What is the cutoff (threshold) frequency for a metal surface that has a work function of 5.42 eV? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 1.31 × 1015 Hz
B. 2.01 × 1015 Hz
C. 3.01 × 1015 Hz
D. 5.02 × 1015 Hz
E. 6.04 × 1015 Hz
Answer: A
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Molecular Speeds: The molecular weight of nitrogen, N2, is 28 g/mol. What is the rms speed of nitrogen molecules in a cooler at 8.0°C? The Boltzmann constant is 1.38 × 10-23 J/K and NA = 6.022 × 1023 molecules/mol.
A. 450 m/s B. 500 m/s C. 550 m/s D. 600 m/s E. 650 m/s
Which of the following could be a hypothesis for the function of the thick waxy coating of a pine needle
A. If the thick, waxy coating is destroyed, the pine needle will turn B. The thick, waxy coating prevents water loss C. What happens to the needle if the thick, waxy coating is brown. destroyed? D. The tree would feel cold without the thick, waxy coating
What kind of activity does the surface of Triton experience?
a. nitrogen geysers b. sulfur-based volcanoes c. carbon dioxide geysers d. methane ice tectonics e. liquid nitrogen lava flows
If the density of the Universe is greater than the critical density, then the expansion of the Universe will continue indefinitely.
Answer the following statement true (T) or false (F)