Discuss the various factors which affect the absorption and emission of photons by a hydrogen atom
What will be an ideal response?
Answer: Electrons orbit the nucleus of atoms in prescribed zones called shells. Upon receiving energy in the form of a photon, the electron is in an excited state and jumps to its next shell. When the electron returns to its ground state, it releases energy in the form of a photon. The energy emitted by such atoms must occur in discrete packets; at the atomic scale, units of energy are divided into individual parcels.
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The classical economic paradigm and the new ecological economic paradigm differ in the way that
A) each views the land, either as a resource within the human economy (classical) or as something that encompasses the economy (ecological).
B) the value of capital is assessed, either in dollars (classical) or as resources that can be mined from the Earth (ecological).
C) labor is determined, either as the number of people who are unemployed not counting farmers (classical) or the number of people who are unemployed counting farmers (ecological).
D) labor and capital are assessed, either counting the total labor and capital resources available (classical) or that which is in use in operations (ecological).
Earthquakes always occur at plate boundaries
a. True b. False
The most effective antimalarial strategies involve the use of
A) DDT, bed nets, and quick access to drug treatment. B) DDT, immunization, and the drainage of all standing water in a region. C) immunizations, surgery, and a change in diet. D) sterilization of mosquitoes, treatment of mosquito breeding sites, and antibiotics.
Most of the eastern United States was originally covered with ________
A) grasslands B) savanna C) midlatitude forest D) boreal forest E) tundra