What is the basis for the use of hydrogen fuel cells?
A. It is extremely energy-efficient.
B. It has not been demonstrated to work for powering vehicles.
C. It is an example of a renewable energy source in action.
D. It will result in the release of pollution to the atmosphere.
Answer: A. It is extremely energy-efficient.
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The element bromine, Br (atomic number 35), has two major isotopes of similar abundance, both around 50%. The atomic mass of bromine is reported in the periodic table as 79.904 atomic mass units. Choose the most likely set of mass numbers for these two bromine isotopes.
A. Br-79, Br-81 B. Br-79, Br-80 C. Br-80, Br-81 D. Br-78, Br-80
Hot spots move with continental plates
a. True b. False
Typically, African governments do not have the investment funds and technical capacity to effectively and efficiently adopt renewable energy technologies
Indicate whether the statement is true or false
The outflow at the top of a hurricane prolongs the storm's lifespan because:
A) it helps to bring in cold air to strengthen the hurricane's eye. B) it provides an outlet for excess moisture that might otherwise "rain out" the storm. C) it prevents surface convergence from "filling in" the low-pressure center of the storm. D) it causes winds to converge at the top of the storm.