The rate at which light energy is radiated from a source is measured in which of the following units?

1 answer:

6 0

The correct answer is A. Lumen

This is the so called energy of light measurement. Other mentioned measurements are used for different things such as measuring light over an area of space or similar.

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Which weather event is capable of destroying homes and uprooting trees due to a low pressure area at its center

Bond [772]

You're talking about a tornado.

It's not so much the low pressure that's so dangerous in the center of a tornado. It's more a matter of the high winds that are caused by the low pressure.

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4 years ago

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How to use heliocentric in your own sentence?

Alexus [3.1K]

According to the heliocentric theory, the sun is the center of everything in the universe.

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How to find a planet’s gravitational field strength using its radius?

grin007 [14]

The gravitational field strength is approximately equal to 10 N.

Explanation:

Gravitational field strength is the measure of gravitational force acting on any object placed on the surface of the planet. Generally, the mass of the object is considered as 1 kg.

So the gravitational field strength will be equal to the gravitational force acting on the object.

The formula for gravitational field strength is

$g = \frac{F}{m}$

Here g is the gravitational field strength, m is the mass of the object placed on the surface and F is the gravitational force acting on the object.

Since, the mass of any object placed on the surface of earth will be negligible compared to the mass of Earth, so the mass of the object is considered as 1 kg.

Then the g = F

And $F =\frac{GMm}{r^{2} }$

Here G is the gravitational constant, M is the mass of Earth and m is the mass of the object placed on the surface, while r is the radius of the Earth.

$g = F = \frac{6 \times 10^{24} \times 6.67 \times 10^{-11} \times 1}{(6.6 \times 10^{6}) ^{2} }$