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kierafisher05
20.07.2019 •
Chemistry
Plutonium−239 (t1/2 = 2.41 × 104 yr) represents a serious nuclear waste hazard. if seven half-lives are required to reach a tolerable level of radioactivity, how long must 239 pu be stored? enter your answer in scientific notation.
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Ответ:
time taken to reach tolerable level = seven half-lives
= 7 x t1/2
= 7 x 2.41 × 10⁴ yrs
= 168700 yrs
= 1.687 x 10⁵ yrs
Hence, the period of time that Plutonium-239 must be stored is 1.687 x 10⁵ years.
Ответ:
Plutonium − 239 must be stored for = 1,687 .10 ^ 5 years to reach a tolerable level of radioactivity
Further explanationThe atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.
Usually radioactive elements have an unstable atomic nucleus.
The main particles emitted by radioactive elements so that they generally decay are alpha (α), beta (β) and gamma (γ) particles
General formula used in decay:
Information :
T = duration of decay
t 1/2 = elemental half-life
N₀ = the number of initial radioactive atoms
Nt = the number of radioactive atoms left after decaying during T time
Plutonium − 239 has a half-life of t1/2 = 2.41 × 10⁴ years
To reach a tolerable level of radioactivity, Plutonium − 239 must be stored for 7 times half-life, namely:
= 7 x 2.41 × 10⁴ years
= 1,687 .10⁵ years
Learn moreThe identity of the missing nucleus
link
the process of radioactive decay
link
nuclear fusion and nuclear fission reactions
link
the product of radioactive decay
link
Keywords: decay, radioactive, Plutonium − 239, The atomic nucleus
Ответ:
C. to protect themselves
D.
Explanation:When an animal closely resembles the color of its surroundings, it is known as protective coloring. The color of the animal helps the animal blend in with the environment and makes it harder for predators to see it. This protects the animal from predators.