The chart below compares the characteristics of four objects, A, B, C, and D, discovered in the solar system.
Characteristics
<
A
B
C
D
Exists in Kupier belt
yes no
no no
S
Is a moon of another
object
no
no
yes
no
Has enough gravity
to keep other objects
far away from its
orbit
no yes yes no
Is in orbit around the
yes yes no yes
sun
Has a long orbit
yes no
no
no
Is almost circular in
shape
no
yes yes yes
Which of these is most likely to be a dwarf planet? (3 points)
O Object A
O Object B
O Object
Object D

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explanation:

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.