Before Einstein, scientists thought that the substance that was "waving" when a light wave was transmitted was
A) phlogisten.
B) air.
C) ether.
D) plasma.
E) They didn't think any material substance was waving.
C
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Phase Angles: A series ac circuit has voltage supplied to it at a frequency of 25.0 kHz with a phase difference between the current and the voltage of magnitude 0.80 rad. If the circuit has a capacitance of 2.0 ?F and an inductance of 0.030 H, find the resistance of the circuit.
A. 4.6 k? B. 0.23 k? C. 19 k? D. 2.06 k?
What does it mean when a website has the https:// protocol designation?
A. The website uses SSL to transmit customer's data. B. The website has been spoofed. C. The website uses a digital signature. D. The website does not use cookies.
After a massive-star supernova, what is left behind?
A) always a white dwarf B) always a neutron star C) always a black hole D) either a white dwarf or a neutron star E) ether a neutron star or a black hole
According to relativity theory, it is possible to reverse time and grow younger when you
A) are near a black hole. B) are near a very large gravitational field. C) travel at nearly the speed of light. D) you can never grow younger. E) none of these