According to our definition, we have been a technological civilization for about
A) 500 years. B) 100 years. C) 10 years. D) 1000 years. E) 10,000 years.
B
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The elements that we are all made of are common everywhere in the observable Universe
a. True b. False Indicate whether the statement is true or false
What is the maximum number of 100-W lightbulbs you can connect in parallel in a 120-V home circuit without tripping the 20-A circuit breaker?
What will be an ideal response?
A diffraction grating has 6000. lines per centimeter ruled on it. What is the angular separation between the second and the third orders on the same side of the central order when the grating is illuminated with a beam of light of wavelength 550
nm?
Two in-phase loudspeakers are 3.0 m apart. They emit sound with a frequency of 490 Hz
A microphone is placed half-way between the speakers and then moved along the line joining the two speakers until the first point of constructive interference is found. At what distance from that midpoint is that first point? The speed of sound in air is 343 m/s. A) 0.18 m B) 0.35 m C) 0.50 m D) 0.70 m E) There is no point in that line where constructive interference occurs.