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Others Like “The Joly Photometer: Measuring Light Intensity Using the Inverse Square Law”

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Science Fair Project Idea
Have you ever looked up at the stars at night and wondered how fast they were moving or how far away they were? By studying how the brightness of a star changes with distance, you can answer those questions. In this astronomy science project, you'll create a model of starlight and use a light meter to discover the key relationship between brightness and distance. Read more
Astro_p034
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- Less Details
Time Required Average (6-10 days)
Prerequisites None
Material Availability Readily available
Cost Low ($20 - $50)
Safety No issues
Science Fair Project Idea
This is a good project for someone who is interested in both electronics and color vision. The equipment needed is on the expensive side, but if you continue studying electronics, you can use it again and again. Read more
Elec_p038
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- Less Details
Time Required Average (6-10 days)
Prerequisites To do this project you should be familiar with Ohm's Law. Experience building electronic circuits on a solderless breadboard is also helpful. The breadboard is the biggest expense, which can be used for future explorations in electronics.
Material Availability Specialty items
Cost Very High (over $150)
Safety Adult supervision required when using power drill.
Science Fair Project Idea
Solar cells are an alternative method for generating electricity directly from sunlight. With this project, you can get down to the atomic level and learn about the world of solid-state electronics as you investigate how solar cells work. Your experiment will measure the effect of changing light intensity on power output from the solar cell. A possible variation would be to investigate the effect of changing the color of the light. Read more
Energy_p014
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Time Required Short (2-5 days)
Prerequisites None
Material Availability Specialty electronics components required, see Materials list for details
Cost Low ($20 - $50)
Safety No issues
Science Fair Project Idea
Here is a riddle for you: name an instrument that you play with your hands but never actually touch. Have you guessed the answer? It is a theremin! This unusual instrument makes sound without anyone touching it. How does a theremin work? It has an antenna that can detect the player's hand nearby, and as they move their hand around the theremin, the sound it makes changes based on the hand's position. In this music science project, you will get to use your own mini theremin to investigate… Read more
Music_p035
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- Less Details
Time Required Average (6-10 days)
Prerequisites None
Material Availability The Theremin Mini Kit for this science project needs to be specially ordered. See the Materials and Equipment list for details.
Cost Average ($40 - $80)
Safety No issues
Science Fair Project Idea
Radiometers are fun-to-watch novelty items, but they also have a distinguished scientific history, having been studied by James Clerk Maxwell and Albert Einstein. A radiometer has a set of four vanes (like small sails) connected to a spindle that is free to rotate. When the radiometer is placed in bright light, the vanes and spindle start to spin. It looks like a magic trick, but there is a scientific explanation for this weird behavior. In this science fair project, you will experiment with… Read more
Phys_p078
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- Less Details
Time Required Average (6-10 days)
Prerequisites This science fair project will require some creative problem solving on your part.
Material Availability You will need to order a digital tachometer and radiometer online. See the Materials and Equipment list for details.
Cost High ($100 - $150)
Safety No issues
Science Fair Project Idea
Solar cells provide a clean way of making electricity directly from sunlight. In this project you will build a simple circuit and experimental setup to investigate whether the power output of a solar cell changes with ambient temperature. Read more
Energy_p012
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- Less Details
Time Required Short (2-5 days)
Prerequisites You must know or must learn how to use a voltmeter or multimeter.
Material Availability Specialty item: digital thermometer with probe
Cost Average ($50 - $100)
Safety No issues
Science Fair Project Idea
"How do you frighten a grasshopper? And what does that have to do with light?" These are a couple of questions you're probably asking yourself after reading the title. Well, The Frightened Grasshopper Solar-Powered Bug is actually a toy grasshopper that vibrates when it is placed in sunlight or near a lightbulb. It stores up the energy from light, and converts it into motion. You will use this fun toy to explore how the brightness of the light affects the motion of the solar-powered insect. Read more
Elec_p061
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- Less Details
Time Required Very Short (≤ 1 day)
Prerequisites None
Material Availability The Frightened Grasshopper toy needs to be ordered from online. See the Materials and Equipment list for details.
Cost Low ($20 - $50)
Safety Adult supervision is required. The lightbulbs will be hot, so use caution to avoid getting burned by the bulbs. The Frightened Grasshopper toy should be assembled with the help of an adult since it is fragile and has some small parts.
Science Fair Project Idea
Global warming, climate change, melting ice caps—these are all big events that have an impact our environment. What can we do to help reduce the impact? We can reduce, reuse, and recycle. What can cities do to help? Cities can eliminate waste by saving energy. Cities around the world are switching from incandescent traffic signals to LED traffic signals to save energy and money. That's because LEDs are more efficient than incandescent lamps, which means that LEDs produce more light… Read more
Energy_p003
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Time Required Long (2-4 weeks)
Prerequisites Prior experience with using a digital multimeter
Material Availability Specialty items (see Materials list)
Cost High ($100 - $150)
Safety Since this science project deals with electricity, adult supervision is recommended. The LEDs used in this project are used in traffic signals and are very bright. Do not look directly at the LED when it is in operation and be sure to wear your sunglasses. Be sure to wear safety goggles when operating power tools.
Science Fair Project Idea
There are two main types of materials when it comes to electricity, conductors, and insulators. What are they made of? Find out by testing different materials in a circuit to see which ones conduct the most electricity. Read more
Elec_p018
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- Less Details
Time Required Very Short (≤ 1 day)
Prerequisites None
Material Availability Readily available
Cost Very Low (under $20)
Safety When working with electricity, take precautions and beware of electric shock.
Science Fair Project Idea
Have you ever dreamed about becoming invisible? Or about making something else invisible, like the mess all over your room? Invisibility may sound like the stuff of science fiction (remember Star Trek's "Cloaking Device"?), but in reality, military vehicles, like planes and ships, can be made less observable, or even invisible, to different detection methods—like radar, sonar, or infrared sensors—by using stealth technology. In this engineering science fair project, you'll find out… Read more
Phys_p075
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- Less Details
Time Required Average (6-10 days)
Prerequisites None
Material Availability Readily available
Cost Low ($20 - $50)
Safety You should never look directly into an LED flashlight, as it can cause eye damage.
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