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ipn [44]
2 years ago
14

If we start with 48 g of a radioactive substance with a 2 hour 12 life, how much is left after two half-lives?

Physics
1 answer:
ivolga24 [154]2 years ago
4 0

Explanation:

 Half-life is the time taken for a radioactive material to decay to half its original composition:

   Original mass = 48g

   Half- life  = 2hr

 

 After four half lives;

           Initially:                48g

    First halving                24

    Second halving          12

    Third halving               6

    Fourth halving             3

After second half life, we would have 12g

At fourth halving, we would have 3g

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A parallel plate capacitor with air between the plates has a potential difference of 71.0 V. Determine the potential difference
Gwar [14]

Answer:

15.8 V

Explanation:

The relationship between capacitance and potential difference across a capacitor is:

q=CV

where

q is the charge stored on the capacitor

C is the capacitance

V is the potential difference

Here we call C and V the initial capacitance and potential difference across the capacitor, so that the initial charge stored is q.

Later, a dielectric material is inserted between the two plates, so the capacitance changes according to

C'=kC

where k is the dielectric constant of the material. As a result, the potential difference will change (V'). Since the charge stored by the capacitor remains constant,

q=C'V'

So we can combine the two equations:

CV=CV'\\CV=(kC)V'\\V'=\frac{V}{k}

and since we have

V = 71.0 V

k = 4.50

We find the new potential difference:

V'=\frac{71.0}{4.50}=15.8 V

6 0
2 years ago
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SpyIntel [72]
I can only offer you one which is mushroom. They're fungus' and they can't produce their own food. They get their food from decaying and dead animals and absorb it through their roots.
8 0
3 years ago
What is the arrangement of the forms of electromagnetic radiation according to their wavelengths?
Svetradugi [14.3K]
Gamma rays then x rays then UVA rays then visible light then IR then radio waves (from highest to lowest frequency).
6 0
3 years ago
The waves with the lowest energy and lowest frequencies of the electromagnetic spectrum are the
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</span>
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3 years ago
Use the drop-down menus to complete the statement about Earth’s magnetism.
Nataly [62]

Answer:

The Earth's magnetism is generated in the core, which is composed of iron that is constantly churning

Explanation:

Magnetic fields are produced by charges in motion, therefore by currents.

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However, its role is very important for the Earth: in fact, it provides a shield that blocks most of the harmful radiation coming from the Sun.

5 0
3 years ago
Read 2 more answers
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