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Rasek [7]
3 years ago
6

Which of these is an example of physical change?

Physics
2 answers:
My name is Ann [436]3 years ago
8 0
That will be A melting a substance that's because the rest are examples of chemical changes and also its the same thing but in a different form.
aleksandrvk [35]3 years ago
7 0

Answer:

Melting a substance

Explanation:

Melting a substance is a physical change. It is a physical change because the process is irreversible that is the product after the substance is melted can be converted back to its original state.

Taking ice as an example, ice being a solid matter can be melted by applying heat. This melted ice will change to water. The water which is the product formed can be freezed to change it back to its initial state which is ice. Hence melting is a physical change.

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From here we see that the wavelength and frequency are inversely proportional. So as the frequency increases the wavelength decreases. 

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3 years ago
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A radioactive material has a count rate of 400 per minute. It has a half life of 40 years. How long will it take to decay to a r
cestrela7 [59]

Answer:

160 years.

Explanation:

From the question given above, the following data were obtained:

Initial count rate (Cᵢ) = 400 count/min

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Time (t) =?

Next, we shall determine the number of half-lives that has elapse. This can be obtained as follow:

Initial count rate (Cᵢ) = 400 count/min

Final count rate (Cբ) = 25 count/min

Number of half-lives (n) =?

Cբ = 1/2ⁿ × Cᵢ

25 = 1/2ⁿ × 400

Cross multiply

25 × 2ⁿ = 400

Divide both side by 25

2ⁿ = 400/25

2ⁿ = 16

Express 16 in index form with 2 as the base

2ⁿ = 2⁴

n = 4

Thus, 4 half-lives has elapsed.

Finally, we shall determine the time taken for the radioactive material to decay to the rate of 25 counts per minute. This can be obtained as follow:

Half-life (t½) = 40 years

Number of half-lives (n) = 4

Time (t) =?

n = t / t½

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Cross multiply

t = 4 × 40

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Answer:

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Electromagnetic waves?
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3 years ago
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