When radium-223 (Z = 88) decays to radon-119 (Z = 86), an alpha particle is emitted
Indicate whether the statement is true or false
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Stars spend about 90% of their lifetime on the main sequence
Indicate whether the statement is true or false
Consider a collection of charges in a given region and suppose all other
charges are distant and have a negligible effect. Further, the electric potential is taken to be zero at infinity. If the electric potential at a given point in the region is zero, which of the following statements must be true? (a) The electric field is zero at that point. (b) The electric potential energy is a minimum at that point. (c) There is no net charge in the region. (d) Some charges in the region are positive, and some are negative. (e) The charge shave the same sign and are symmetrically arranged around the given point.
1.(a) only 2.(d) only 3.(b), (c), and (d) 4.(a) and (e)The ____________________ is the point on the celestial sphere directly above an observer, regardless of where the observer is located on Earth
Fill in the blank(s) with correct word
Which of the sounds matches the real universe?
A: the one with 2% of the density in atoms B: the one with 4% of the density in atoms C: the one with 8% of the density in atoms