A certain ac signal at 1000 Hz is applied across an inductor and a 100-? resistor. If the power factor of the circuit is 0.400, what is the impedance of this circuit?
A) 150 ?
B) 200 ?
C) 250 ?
D) 100 ?
E) 300 ?
C
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On a planet where atmospheric gases are red, distant dark mountains would appear
A) bluish. B) greenish. C) yellowish. D) reddish. E) untinted.
You observe two stars that are identical to our Sun, but that are located at di?erent distances from Earth. Which star is the most luminous?
A) They are both the same luminosity. B) The one that appears brightest in our sky is more luminous. C) The one that appears faintest in our sky is more luminous. D) There is no way to tell from the information given.
Why would a hotter star appear blue-white while a cooler star appear red or not be visible at all?
What will be an ideal response?
Matter Waves: A proton that is moving freely has a wavelength of 0.600 pm. (mproton = 1.67 × 10-27 kg, e = 1.60 × 10-19 C, h = 6.626 × 10-34 J ? s)(a) What is its momentum?(b) What is its speed?(c) What potential difference would it have been accelerated through, starting from rest, to reach this speed?
What will be an ideal response?