Called a(n) convection current
The correct answer is letter D. distance to a star.
In astrophysics, M = m - 5 log(d/10)
where
m - apparent magnitude
<span>M - absolute magnitude </span>
<span>m - apparent magnitude </span>
<span>d - distance measured in parsec </span>
Alpha decay lowers the atomic number of an element. The correct option is B. Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle, which is an helium particle. During this process, the atomic number of the nucleus is reduced by two and the mass number is reduced by 4.
Answer: 20
Explanation: I’m in your class.
Proton mass = 1.00728 amu
neutron mass = 1.0086 amu
electron mass = 0.000549 amu
so the mass is :
(7 * 1.00728) - (7 * 1.0086) - (7 * 0.000549) - 14.003074
= 0.11235 amu