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larisa86 [58]
2 years ago
15

Which of the following statements is true? Radiation is the transfer of heat between objects which are not touching. An insulato

r speeds up the vibration of molecules and the transfer of heat. Heat is transfered in solids through conduction. All of the sun's heat is reflected by the Earth's atmosphere.
Chemistry
1 answer:
Licemer1 [7]2 years ago
3 0

Answer:

Radiation is the transfer of heat between objects which are not touching. I think

Explanation:

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1st one is right..it helps filter waste inside the cell.

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What was the effect of decreasing the copper's mass?
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Increasing the temperature of the copper made the final temperature increase and decreasing the temperature of the copper made the final temperature decrease. ... How does changing the initial mass of the copper affect how much heat energy it has? The more copper, the more heat energy.

Explanation:

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A sample of water vapor condenses to form liquid water. What change in water
mel-nik [20]

Answer:

Condensation is the process of water vapor condensing into liquid water.

Explanation:

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7 0
3 years ago
4. DBearded waste of Co-60 must be stored until it is no longer radioactive. Cobalt-60
Bingel [31]

464 g radioisotope was present when the sample was put in storage

<h3>Further explanation</h3>

Given

Sample waste of Co-60 = 14.5 g

26.5 years in storage

Required

Initial sample

Solution

General formulas used in decay:  

\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}

t = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time  

Half-life of Co-60 = 5.3 years

Input the value :

\tt 14.5=No.\dfrac{1}{2}^{26.5/5.3}\\\\14.5=No.\dfrac{1}{2}^5\\\\No=\boxed{\bold{464~g}}

8 0
3 years ago
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