Lightning occurs as water droplets in a cloud become electrically charged. Energy is positively charged
A) at the base of the cloud.
B) at the top of the cloud.
C) throughout the cloud.
D) surrounding the cloud.
Answer: B
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Which of the following is a positive subatomic particle?
a. neutron only b. proton only c. electron only d. neutron and proton e. proton and electron
By approximately _________ years ago, _________ had produced oxygen in enough amounts to be a significant fraction in Earth's atmosphere.
a. 100 million; trees and plants b. 1 billion; trees and plants c. 250 million; bacteria and algae d. 2.5 billion; bacteria and algae e. 2,000; animals and humans
The ________-year solar cycle is characterized by a variation in the number of sunspots and a reversal of the polarity of the Sun as a whole
Fill in the blank(s) with correct word
If a metal had a Fermi level of 5.0 eV, what would be the average energy of the electrons at 0 K?
A) 8.0 eV B) 6.0 eV C) 3.0 eV D) 0 E) 5.0 eV