Glass in a florist's greenhouse acts as a one-way valve in that it
A) lets light energy flow only in one direction.
B) cuts off unwanted radiation.
C) allows high-frequency waves in and blocks low-frequency waves exiting.
D) is transparent only to lower-frequency waves.
Answer: C
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Our Milky Way Galaxy is now known to be quite similar to the nearby Andromeda Galaxy, M-31
Indicate whether the statement is true or false
An example of a diverging spherical mirror is
a. a bathroom mirror. b. a round Christmas tree ornament. c. a flashlight reflector. d. none of these.
The ____________________ are theories that unify the electromagnetic, weak and strong forces at extremely high energies
Fill in the blank(s) with correct word
How can the Doppler method be used to estimate the average orbital distance of a planet's orbit?
A) by measuring the speed at which the star orbits the mutual center-of-mass of the star and planet, and using Newton's theory of gravity B) by measuring the time it takes for the star's line-of-sight velocity to cycle from peak to peak, and using Newton's version of Kepler's Third law C) by measuring the asymmetries in the velocity curve D) by measuring the amount by which the starlight is reduced when the planet transits