Whose work with SETI led to the discovery of pulsars in 1967?
A) Jocelyn Bell
B) Sir Bernard Lovell
C) Anthony Hewish
D) Martin Schwarzschild
E) Stephen Hawking
A
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A new generation of ground-based telescopes is currently being built that overcomes the limitations of the older large telescopes. Some of these new telescopes
a. use segmented mirrors. b. use mirrors that are very thin. c. use active optics to control the shape of the mirror. d. All of the other choices are correct. e. None of the other choices are correct.
Considering only the role of dark matter and keeping all other factors the same, which hypothetical universe is oldest?
A) the one with more dark matter B) the one with less dark matter C) Dark matter doesn't affect the inferred age of the universe.
Dielectrics: A 15-?F capacitor is connected to a 50-V battery and becomes fully charged. The battery is removed and a slab of dielectric, having a dielectric constant of 5.0, is inserted between the plates and completely fills the space between them.(a) What is the capacitance of the capacitor after the slab is inserted?(b) What is the potential difference across the capacitor with the dielectric inserted.
Fill in the blank(s) with the appropriate word(s).
What is the lowest value for n of a shell that can contain a g electron?
a. 5 c. 3 b. 4 d. 6