7.7. A painter leans his back against a painted wall while looking into a 1m long mirror at the opposite end of a rectangular ro
om as shown in the given figure. How much of the painted wall can he see through the given mirror?
a. 1m
b. 2m
c. 12m
d. 6m
a. 1m
b. 2m
c. 12m
d. 6m
1 answer:
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Answer: Thus X is Plutonium
Explanation:
Alpha Decay: In this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units and atomic number is reduced by 2 units.
General representation of alpha decay :
where Z = atomic number
A= mass number
X and Y = atomic symbol of elements
Thus
Thus X is Plutonium with atomic number 94 and mass number 239
Answer:
It's called carbon dioxide.
Explanation:
consists of 1 carbon atom bonding with two oxygen atoms.