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andreyandreev [35.5K]
3 years ago
10

what is the percent efficiency of a light bulb that emits 14 joules of light for every 60 joules of electric energy thst enters

it?
Physics
1 answer:
jasenka [17]3 years ago
5 0
If you're using the bulb as a source of light, then it's. 14/60 = 23.3% efficient.
If you're using it to heat a bird nest or a hamster cage, then it's. 46/60 = 76.7% efficient !
It just depends on your point of view, and what you consider 'useful' output.
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Answer:

<em>C. the blue colour of the Earth's sky</em>

<em></em>

Explanation:

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The reflection nebula of the Pleiades is due to the scattering of the blue light from the hot blue luminous stars that dominate the star cluster. Th blue light is scattered from dust molecules, thought to be predominantly carbon compound like diamond dusts, and other compounds like iron.

The blue colour of the Earth's sky is the closest terrestrial phenomenon to the reflection nebula. On a clear cloudless day, molecules in the air scatter the blue component of light more than the other component colours of white light, giving the sky its characteristic blue coluor.

The common characteristics of the luminous nebula and the Earth's blue sky is that they both have their light scattered by the presence of small particles.

8 0
3 years ago
A truck speed from rest to 120km/h in 13s. Find its acceleration. (convert to m/s)
ioda

answer:

2.5 m/s²

Explanation:

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4 0
2 years ago
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ale4655 [162]

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