What is the main tenet of Plank's quantum hypothesis?
A. Light is composed of waves that exist only at certain quantum fundamental frequencies.
B. Energy is a continuum, but light is quantized.
C. Energy is composed of subatomic particles called quanta.
D. Energy can be converted into matter through nuclear quanta.
E. Energy comes in discrete packets of a certain minimum size.
Answer: E
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The Chota Nagpur Plateau south of India's Ganges Plain is the country's center for
A. iron and steel production. B. cotton production. C. wheat production. D. electronics and computer production.
Radium in groundwater
A. makes the water unsafe for bathing. B. occurs only near leaking radioactive-waste dumps. C. can be removed by water softeners. D. All of the choices are correct.
Using Figure 16.28 in your textbook, a flood level that occurred five times in 50 years is known as
A) a 5-year flood. B) a 10-year flood. C) a 25-year flood. D) a 50-year flood.
Which continents currently have sufficient water to meet the needs of their populations?
-North America, South America, Africa, and Australia -Europe, Africa, and Australia -North America, Asia, and South America -Europe, Africa, and Asia