Reactance: At what frequency will a 14.0-mH coil have 14.0 ? of inductive reactance?
A. 1000 Hz
B. 505 Hz
C. 257 Hz
D. 159 Hz
Answer: D
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Consider the experimental evidence we have discussed in the past few chapters. Classify the following experimental results according to the following scheme: For the quantons in question, the results:
A. Are consistent with a pure wave model. B. Are consistent with a pure particle model. C. Are consistent with either model (the results do not distinguish between models). D. Cannot be explained by either model alone.
What do X-ray observations tell us about conditions around a potential nova?
What will be an ideal response?
Find the frequency of X-rays of wavelength 1 Å = 10?10 m
a. 3 × 10^18 Hz b. 3 × 10^10 MHz c. 6 × 10^9 Hz d. 3 × 10^8 Hz e. 3 × 10^20 Hz
Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 93 hours. the star becomes dimmer for about 2 hours. The most likely explanation for this is that the star ________
a. has a very large "sunspot" on its surface b. is a member of an eclipsing binary star system c. is a white dwarf d. is a Cepheid variable e. is periodically ejecting gas into space, every 93 hours