If a sheet containing a single thin slit is heated (without damaging it) and therefore expands, what happens to the width of the central bright diffraction region on a distant screen?
A) It gets narrower.
B) It gets wider.
C) It doesn't change.
B
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If the orbital velocity of an eclipsing binary is 97 km/s and the smaller star is completely eclipsed in 2 hours, what is the diameter of the smaller star?
a. 175,000 km b. 350,000 km c. 194 km d. 700,000 km e. 4656 km
The farthest bright galaxies that modern telescopes are capable of seeing are up to
A) 10 billion light years away. B) 10 million light years away. C) 1 trillion light years away. D) 1 million light years away. E) 1 billion light years away.
A heater is rated at 1200 watts for a 120-volt source.The current in amperes drawn by the heater is
a. 0.1 b. 10. c. 144,000 d. none of the above.
Two light bulbs, a thick-filament one and a thin-filament one, are connected in series to a battery. The voltage is greater across the lamp with the
A) thick filament. B) thin filament. C) same for both