Intensity of Light and Inverse Square Law

Intensity of Light and Inverse Square Law

Assessment

Interactive Video

Physics, Mathematics, Science

7th - 10th Grade

Hard

Created by

Lucas Foster

FREE Resource

This video tutorial explains the inverse square law using a light bulb as an example. It demonstrates how the intensity of light changes with distance, showing that intensity is inversely proportional to the square of the distance. The video includes calculations for different distances and a word problem to illustrate the concept further.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the inverse square law describe in relation to a light bulb?

The color of the light emitted

The intensity of light based on distance

The temperature of the light bulb

The shape of the light bulb

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which formula represents the intensity of light according to the inverse square law?

Intensity = Power - Distance

Intensity = Power + Distance

Intensity = Power / (4πr²)

Intensity = Power x Distance

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If the distance from a light source is doubled, what happens to the intensity?

It becomes one-half

It becomes one-fourth

It remains the same

It doubles

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the intensity of light at 3 meters if it is 360 watts per square meter at 1 meter?

120 watts per square meter

90 watts per square meter

40 watts per square meter

160 watts per square meter

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does the intensity change if the distance is tripled?

It remains the same

It reduces by a factor of 6

It reduces by a factor of 9

It reduces by a factor of 3

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the intensity of light at 4 meters if it is 800 watts per square meter at 3 meters?

600 watts per square meter

400 watts per square meter

800 watts per square meter

900 watts per square meter

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the word problem, what is the initial intensity at 4 meters?

1000 watts per square meter

400 watts per square meter

600 watts per square meter

800 watts per square meter

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