What does it take to allow us to observe a neutron star as a pulsar?
What will be an ideal response?
The neutron star must be still spinning rapidly enough to generate a strong magnetic field and emit radiation in two narrow beams. If its rotation sweeps one of both of these beams past Earth we can detect it.
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The symbol for a certain isotope of polonium is Po. How many neutrons are there in the nucleus of this isotope?
A) 84 B) 130 C) 214 D) 298 E) 314
A thermostat can work because of a bimetallic strip
a. True b. False Indicate whether the statement is true or false
Because of Mercury's lower gravity, ejecta from a meteorite covers much of its surface
a. True b. False Indicate whether the statement is true or false
What are the two possible explanations for not seeing something glowing brightly along every line-of-sight?
I) The universe is infinite in size and infinitely old, but dust absorbs starlight from far away stars. II) The universe has a finite number of stars. III) The universe is changing in some way as to prevent us from seeing an infinite number of stars. A) I and III B) II and III C) I and II