Quasar's spectral lines are:
A) emission lines with large redshifts.
B) a continuum from the synchrotron radiation.
C) fuzzy absorption lines from the merged light of the billions of stars.
D) too complex for any interpretation.
E) nonexistent, the gas so hot as to be totally ionized, so no lines are seen.
A
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A) aurorae B) plutinos C) ovoids D) ovoli
The temperature of the photosphere of the Sun is closest to:
A. 600000 K B. 100 K C. 107 K D. 106 K E. 6000 K
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A) 0.9999c B) 0.9666c C) 0.9888c D) 0.9777c E) 0.8777c
The position of a particle moving along the y axis has a position given by
?
?
Is there any time interval during which the particle is not moving?
A. Yes, from 0.60 s to 1.00 s. B. Yes, from 0.795 s to 0.805 s. C. Yes, at the time t = 0.80 s. D. No, the velocity is never zero. E. No, an instant is not the same as a time interval.