If our year were twice as long (that is, if Earth took twice as many days to complete each orbit around the Sun), but Earth's rotation period and axis tilt were unchanged, then
A) stars would take twice as long to rise and set.
B) the cycle of precession would take 13,000 years instead of 26,000 years.
C) the four seasons would each be twice as long as they are now.
D) the Earth would not have seasons.
C
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An intermediately wound barred spiral galaxy would, in Hubble's system, be:
A) BS2. B) BSE.5. C) SBb. D) S2B. E) SIrr.
How do the densities of the jovian and terrestrial planets compare?
A) Made from the same solar nebula, they are all similar. B) More massive jovians all have high densities, compared to the tiny terrestrials. C) All terrestrials are more dense than any of the jovians. D) The closer a planet lies to the Sun, the less its density. E) No real pattern here; densities vary greatly and are very individual to each world.
An acceleration is evidence of ______________
Fill in the blank(s) with correct word
The Lyman series of hydrogen corresponds to electron transitions from higher levels to n = 1 . What is the longest wavelength in that series? (h = 6.63 × 10^-34 J×s. The ground state of hydrogen is at –13.6 eV.)
a. 91.4 nm c. 456 nm b. 273 nm d. 122 nm