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statuscvo [17]
3 years ago
5

A __________ is the amount of light given off by a light source from a certain angle that is perceived by the human eye.

Biology
2 answers:
mihalych1998 [28]3 years ago
8 0

Answer:

Lumen

Explanation:

Luminous flux is known as the power of light perceived by the eye. The SI unit of luminous flux is known as lumen where one lumen is the amount of luminous flux emitted from a directional unit point source through a unit solid angle.

Since the human eye can see only the visible spectrum of light which is perceived in the form of luminous flux and thus lumen.

Thus, the lumen is the correct answer.

Inessa [10]3 years ago
5 0

Answer:

Lumen.

Explanation:

Lumen may be defined as the S.I. unit of the luminous flux and denoted by the ln. The human eye can only see the wavelength of the lights lies in the visible spectrum.

The power of light perceived by the eye is known as Luminous flux . One lumen may be defined as the amount of luminous flux emitted from a directional unit point source through the unit solid angle.

Thus, the lumen is the correct answer.

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Which source creates the most direct pollution?
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Answer:

Water pollution is one of  the most common type of pollution that leads to the deterioration of the water quality mainly due to the man-made interference. Direct and indirect pollution are two of its types. Direct pollution as the term suggests refers to the direct flow of pollutants in the water in contrast to the indirect pollution that  accounts for the transport of pollutants eventually to the water body.

Explanation:

Direct pollution is characterized by the release of toxic fluid directly in the water body. The main source of this type of pollution are the toxic pollutants from the large factories. Some of the other sources includes solid waste from the household activities and waste from agricultural practice like fertilizers, and the waste generated by the waste water treatment plant.  

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3 years ago
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DedPeter [7]
I believe the answer is B!
3 0
3 years ago
Which practice can be categorized as a sustainable practice?
White raven [17]

Answer:

Which practice can be categorized as a sustainable practice?

Any practices that supports continuity is termed as sustainable such as personal hygiene which enables to curb the ;persistence of infectious diseases. Ordinarily, practicing personal hygiene is sustainable and would greatly reduce infectious diseases globally especially endemic areas.

Explanation:

6 0
3 years ago
Explain the difference between renewable and nonrenewable resources and give an example of each.
Lelu [443]

Answer:

Nonrenewable Resources take longer to be replenished, reneweable resources are easily replenished and easily accessible.

Explanation:

If something is Nonrenewable; for example fossil fuels like coal, oil, and natural gas, then that means that the organic matter is limited and not going to grow or be created easily on Earth.

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Hope this helped :)

6 0
2 years ago
Most cells cannot harness heat to perform work because
Daniel [21]

Answer:

Temperature is usually uniform throughout a cell (Ans. C)

Explanation:

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It can only perform work if it is transferred from one source which is warmer to a body which is cooler. The temperature in living organisms is usually kept very constant due to the process of homeostasis.

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