Photoelectric effect
Why can the same light beam eject electrons from one metal but none from another? Which properties of the light determine the photoelectrons' energy?
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PHYSICS · 9 EXPLORATION STEPS
Measuring electromotive force and internal resistance
How can a voltmeter, ammeter and sliding rheostat measure an old dry cell's electromotive force and internal resistance? Does changing the circuit give the same result?
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▶ Open 3D simulationYOUR EXPLORATION
One step, one new insight.
- 01
Explore the circuit arrangement
- 02
Set maximum resistance first
- 03
Measure several data sets
- 04
Plot U–I
- 05
Vertical-axis starting value
- 06
Only two data sets
- 07
Change circuit arrangement
- 08
Error analysis
- 09
Assessment
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Charging and discharging a capacitor
What does a capacitor actually store? Can a single quantity describe its ability to store charge?
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The relationship between acceleration, force and mass
Without measuring force or acceleration directly, can a paper tape and a few masses reveal the relationship between a, F and m?
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