Explanation:
When plutonium - 239 undergoes an alpha decay, it produces uranium - 235 in the process.
A radioactive occurs when a nuclide spontaneously disintegrates due to instability to produce lighter atoms which the release of radiation and energy.
²³⁹₉₄Pu ⇒ ²³⁵₉₂U + ⁴₂He + energy
In a nuclear reaction, the mass and atomic numbers must always remain conserved. Nuclear reactions do not obey the law of conservation of matter and mass.
The mass number are the superscript before the symbol of the nuclide
The atomic number is the subscript.
The sum of the atomic number on the left hand side equals that on the right hand side. This goes for the mass number too.
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Balanced nuclear equation brainly.com/question/10094982
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Answer:
the intensity will be 4 times that of the earth.
Explanation:
let us assume the following:
intensity of light on earth =J
distance of earth from sun = d
intensity of light on other planet = K
distance of other planet from sun = 
(from the question, the planet is half as far from the sun as earth)
from the question the intensity is inversely proportional to the square of the distance, hence
- intensity on earth : J =
J
= 1 ... equation 1
- intensity on other planet : K =
(the planet is half as far from the sun as earth)
K
= 1 ....equation 2
- equating both equation 1 and 2 we have
J = K
J = K
J = 
K = 4J
intensity of light on other planet (K) = 4 times intensity of light on earth (J)
C, planets orbit around the sun because of gravity
