Half-life is the time a celestial body has left in its evolution
a. True
b. False
Indicate whether the statement is true or false
False
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The Doppler method seeks to detect planets by
A) precisely measuring distances to stars. B) directly detecting the light of planets orbiting stars. C) measuring small changes in the positions of stars on the sky. D) precisely measuring the velocities of stars moving toward and away from us. E) measuring small changes in the apparent brightness of stars.
Treat each of your eyes as a circular aperture of diameter 3.5 mm. Light of wavelength 500 nm is used to view two point sources that are 283 m distant from you
How far apart must these two point sources be if they are to be just resolved by your eye? Assume that the resolution is diffraction limited and use Rayleigh's criterion.
Using the scale in the diagram below, what is the diameter of Jupiter?
a.
about 7.0 × 104 km
b.
about 7.0 × 105 km
c.
about 1.4 × 104 km
d.
about 1.4 × 105 km
e.
about 3.5 × 106 km
Suppose you are observing a binary star with a telescope and are having difficulty resolving the two stars. You decide to use a colored filter to help you. Should you choose a blue filter or a red filter?
1.blue filter 2.red filter 3.neither because colored filters have no effect on resolution