Distance and the Inverse Square Rule

The Inverse Square Law does not work for which of these?

• sound

• light

• laser beams

• electrical force

• gravity

Tags

NGSS.HS-ESS1-4

NGSS.HS-PS2-4

If you receive 10 Sieverts of nuclear radiation at a distance of 8 meters from a radioactive barrel, then you receive ____ Sieverts at distance of 2 m.

• 160

• 40

• 20

• 2.5

If you receive 27 Watts of sound power when 1 meter from a speaker, then you receive ____ Watts at a distance of 3 meters.

• 9

• 24

• 3

• 81

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-5

Light Intensity: As one gets further from a light source, the intensity of light....

• Increases

• Decreases

• Gets brighter

• Gets more luminous

As one approaches (gets closer) to a light bulb, the brightness of the bulb....

• Increases (brighter)

• Decreases

• Stays the same

• Changes in some unknown way

Earth is 93 million miles from its Sun. Mercury is the closest, and Neptune is the furthest from the Sun. Which one of these experiences the greatest intensity of light energy?

• Mercury

• Earth

• Neptune

• All 3 receive the same sunlight intensity.

A student stands 10 feet away from a light bulb. The student walks toward the light bulb to a 5 feet distance. Which is true? Intensity = constant / d².

• The bulb appears 2X brighter

• The bulb appears 4X brighter

• The bulb appears 5X brighter

• The bulb appears 25X brighter

Tags

NGSS.HS-PS4-3

At a distance of 1 m, the intensity of light is spread over an area of 1m x 1m = 1m². At a distance of 2 m, the light is spread out to an area of ___.

• 1 m²

• 2 m²

• 4 m²

• 8 m²

SOLVE: A light bulb has an intensity of 50 watts at a distance of 1 meter. What is the intensity of the light at 5 meters? Intensity = constant / d²

• 1 watt

• 2 watts

• 5 watts

• 10 watts

SOLVE: An iPhone light shines at 40 watts from 6 meters away. What is the intensity of light at 2 meters away?

• 120 watts

• 160 watts

• 360 watts

• 720 watts

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

NGSS.HS-PS4-5