Discuss what you see viewing a distant street light through a thin curtain (at night)
What will be an ideal response?
One expects to see a "cross" pattern of light which turns out to be the diffraction pattern of the many crossed threads forming multiple two dimensional openings. Note that where the curtain is folded at an angle the pattern enlarges because the projected opening in the line of sight is less and the diffracted angle larger. Close attention will show a colored pattern since large wavelengths are diffracted greater.
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A 500-W device is connected to a 120-V ac power source. What is the peak voltage across this device?
A) 4.2 V B) 5.9 V C) 120 V D) 150 A E) 170 V
Most SETI searches are done at
A) X-ray wavelengths. B) visual wavelengths. C) infrared wavelengths. D) radio wavelengths. E) gamma wavelengths.
The energy emitted from the surface of a main sequence star is less than the energy generated in the core
a. True b. False Indicate whether the statement is true or false
If gravity alone acts to retard the expansion and nothing acts to accelerate it, the Universe is said to be closed if I. gravity is strong enough to stop the expansion in a finite time. II. the density of the Universe is less than the critical density. III. the Universe is finite
a. I & II b. I & III c. II & III d. I, I, & III e. None of the other choices are correct.