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3 years ago

Pre-Test

Biology

1 answer:

Dmitry_Shevchenko [17]3 years ago

6 0

Answer:

b. Nuclear energy is contained in nuclear bonds.

Explanation:

Nuclear energy is contained in nuclear bonds which is released when these bonds are broken. Nuclear energy is more efficient than other forms of energy because it produces more energy as compared to other sources of energy production. There are some special type of contained in which certain materials are used to control the flow of nuclear energy and also to contained it.

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The splitting of a heavy nucleus is called

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Answer:

nuclear fission

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3 years ago

Wood deposits recovered from an archaeological site contain 36% of the C-14 they originally contained. How long ago did the tree

Veseljchak [2.6K]

Answer: It was obtained 8515 years ago

Explanation:

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant

a - x = amount left after decay process

a) to find the rate constant:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

$t_{\frac{1}{2}}=\frac{0.693}{k}$

$k=\frac{0.693}{5760}=0.00012years^{-1}$

b) for completion of 36% of reaction

$t=\frac{2.303}{k}\log\frac{100}{36}$

$t=\frac{2.303}{0.00012}\log\frac{100}{36}$

t = 8515 years

The time was 8515 years.

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3 years ago

Modern corals are restricted to growing in warm, clear, well-lit, shallow water. Over the last two million years, coral reefs ha

vova2212 [387]

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Read 2 more answers

Ber [7]

I believe the answer is a and d and b not 100% sure

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3 years ago

What causes movement of water through xylem

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Transpiration is the main driver

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2 years ago