Imagine that you are trying to stop neutrinos with a lead shield. How thick would you need to make this shield to ensure that it can stop a neutrino?
A) about 700,000 kilometers (the radius of the Sun)
B) about 150 million kilometers (the size of an astronomical unit)
C) about 14 billion light years (the size of the observable universe)
D) about one light year
E) about one meter
D
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Arc seconds are _______________th of an arc minute
Fill in the blank(s) with correct word
When we look at an object that is 1,000 light-years away we see it
A) as it was 1,000 years ago. B) as it was 1,000 light-years ago. C) as it is right now, but it appears 1,000 times dimmer. D) looking just the same as our ancestors would have seen it 1,000 years ago.
Hot cider is poured into a metal cup. Shortly thereafter the handle of the cup becomes hot. This is due to the process of
A. conduction. B. radiation. C. convection. D. It will remain the same if the work done exceeds the heat added.
A 200-m radio telescope is used to investigate sources emitting a 21-cm wavelength. The minimum angular separation resolvable for this system is
A) 0.073°. B) 0.03°. C) 0.0013°. D) 0.154°. E) 0.0026°.