When you see your shadow on a sunny day, it has a fuzzy edge. This is
A. an example of diffraction.
B. not caused by diffraction because the wavelength of visible light is too small to produce visible diffraction around a person.
C. not caused by diffraction because diffraction only occurs for openings, not objects blocking light.
D. not caused by diffraction because there are too many wavelengths in sunlight to see the effect.
Answer: B
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The Big Bang theory can explain
A. the relative abundance of helium in the Universe B. the expansion of the Universe C. the cosmic microwave background radiation D. All of these choices are correct.
A person with a longer near point can see an object as closely with the unaided eye as can a person with the shorter near point
Indicate whether the statement is true or false
Spiral arms are clearly visible features of galaxies because most sun-like stars in the disk are found there
a. True b. False Indicate whether the statement is true or false
One of the products of combustion is water. Why doesn't this water extinguish the combustion?
A) While areas of combustion are being extinguished, new areas are combusting. B) Combustion only produces micro amounts of water. C) The chemical combustion reaction is happening too fast for the water to have an effect on the fire. D) This water is in the gaseous phase and merely floats away from the fire.