Brightness of Light

• 2 minutes and 8 seconds (128 seconds) 

• 4 minutes and 10 seconds (250 seconds) 

• 8 minutes and 20 seconds (500 seconds)

• 10 minutes and 20 seconds (620 seconds)

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 appears to....

• Increase (get brighter)

• Decreases

• Stays the same

• Changes in some unknown way

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

Earth's Sun is 93 million miles from Earth. Mercury is closest and Neptune is the furthest planet. Which one experiences the greatest intensity of light energy?

(*of the 3 given)

• Mercury

• Earth

• Neptune

• All 3 receive the same sunlight intensity (it's the Sun)

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 = 1 / d²

• The bulb appears 2x's brighter

• The bulb appears 4x's brighter

• The bulb appears 5x's brighter

• The bulb appears 25x's brighter

At a distance of 1m, the intensity of light is spread over a 1m x 1m area. What is the area of light spread out at distance 2m?

• 1 m²

• 2 m²

• 4 m²

• 8 m²

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

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 = 1 / d²

• 1 watt

• 2 watts

• 5 watts

• 10 watts

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

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

What does the outlined picture below illustrate?

• Visible Light Spectrum

• Electromagnetic Spectrum

• Frequency Indicator

• Color Line

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Of the visible spectrum, what color has the longest wavelength?

• Blue

• Green

• Yellow

• Red

• Violet

Tags

NGSS.MS-PS4-1