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3 years ago

Name two methods scientist use to obtain empirical evidence

1 answer:

3 0

The scientists use data and measurement to obtain empirical evidence. Data can be collected through direct observation or else experimentation. Empirical measurements and data can be gathered by using qualitative and quantitative methods. Empirical evidence contains the recording and analyzing the data which is a central part of scientific method.

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Which of the following is a fossil fuel? A. Coal B. Wind energy C. Biomass energy

almond37 [142]

A. Coal

is the correct answer

5 0

3 years ago

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Carbon-14 has a half-life of 5,730 years. if the age of an object older than 50,000 years cannot be determined by radiocarbon da

Aleonysh [2.5K]

<h3>Answer;</h3>

Carbon-14 levels in a sample are undetectable after approximately 9 half lives

<h3>Explanation;</h3>

The half life of Carbon-14 is 5,730 years . Half life is the time taken by a radioactive material to decay by half of its original mass. Therefore, it would take a time of 5730 years for a sample of 100 g of carbon-14 to decay to 50 grams

A period of 50,000 years, is equivalent to;

 50,000÷5,730 

= 8.73 half lives

Which is approximately equal to 9 half lives.

Therefore, if the age of an object older than 50,000 years cannot be determined by radiocarbon dating, then Carbon-14 levels in a sample are undetectable after approximately 9 half lives.

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3 years ago

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Correct answer gets marked brainly

daser333 [38]

Answer:

CHEMICAL WHETEARING

Explanation:

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3 years ago

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When humans look at the sky, it appears blue, but the Sun appears yellow. What causes this phenomenon?

Lesechka [4]

I believe that the answer is C. The atmosphere scatters blue light more than yellow light.

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4 years ago

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Two bodies of mass m₁ & m₂ are moving with the same velocity 'v' K.E. will be greater for??

boyakko [2]

Answer:

the one with a higher mass

Explanation:

The body with more mass will have the greater kinetic energy of the two.

Kinetic energy is the energy due to the motion of body. It is mathematically expressed as:

K.E = $\frac{1}{2}$ m v²

m is the mass

v is the velocity

Since the velocity of the two bodies are the same, and mass is directly proportional to kinetic energy, the body with more mass will have a higher kinetic energy.

So between mass m1 and mass m2, the one with a greater mass will have a higher kinetic energy

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3 years ago