Different isotopes have
A. the same number of protons in the nucleus
B. the same number of neutrons in the nucleus
C. the same number of electrons in the nucleus
D. the same mass number
A. the same number of protons in the nucleus?
You might also like to view...
A few decades ago, there was great controversy among astronomers over the question of quasar distances, with some arguing that quasars are much nearer than application of Hubble's law would seem to imply
Why do nearly all astronomers now agree that quasars really are quite far away? A) We now have images and spectra that show quasars to be embedded at the centers of distant galaxies and within distant galaxy clusters. B) All quasars have large redshifts. C) Now that we can explain bright quasar emission with power due to the presence of supermassive black holes, there is no reason to doubt that quasars are far away. D) No one could think of a way to explain quasar speeds if they are nearby, so we concluded they must be far away.
Given that there are several hundred billion stars in the Milky Way Galaxy and preliminary data from exoplanet studies suggest that as many as one in five star systems may have one or more habitable planets, then a reasonable estimate for the number
of habitable planets could be about A) 100 billion or more B) 1 billion or more C) 100 million or more D) 10 million or more
Most radio galaxies belong to Hubble's class ________
Fill in the blank(s) with correct word
An eclipse season is the interval during which the sun crosses a node of the moon's orbit
Indicate whether the statement is true or false