A corner cube is formed by three plane mirrors perpendicular to one another resulting in a retroreflector. What is the angle between the directions of an incoming ray of light and of the corresponding outgoing ray of light for this device?
a. 90° b. 180°
c. 0° d. 360°
b
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Magnetic reversals of the Earth's field have occurred on the average every 200,000 years over the past 5 million years. When was the last magnetic reversal?
a. about 200,000 years ago c. about 990,000 years ago b. 1792 d. about 780,000 years ago
The electrolysis of water breaks up the water molecules into hydrogen and oxygen, as shown in this photo. Why is the volume of the hydrogen that is collected twice the volume of the oxygen collected?
a. Hydrogen atoms are twice as big as oxygen atoms. b. There are twice as many hydrogen atoms in water as there are oxygen atoms. c. Oxygen atoms are 16 times as massive as hydrogen atoms. d. A gas formed from oxygen gas particles takes up twice as much space as a gas formed from the same number of hydrogen gas particles under identical conditions. e. The hydrogen occurs as H2 molecules of two atoms each while the oxygen is just single O atoms.
The presence of a Mercurian magnetic field surprised the planetary scientists on the Mariner 10 team because
A) Mercury is low in iron. B) Mercury spins too rapidly to produce a stable dynamo. C) it's still too hot for its core to have differentiated. D) the dynamo theory predicted that Mercury was spinning too slowly for one. E) Mercury lacks an iron core.
Blood as it enters the lungs has a high concentration of carbon dioxide and a low concentration of oxygen. The blood leaves the lungs with a high concentration of oxygen and a low concentration of carbon dioxide. What are the qualitative concentration gradients of CO2 and O2 in the lungs?
What will be an ideal response?