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More Lessons for High School Chemistry

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A series of free High School Chemistry Video Lessons.

In this lesson, we will learn

- Electromagnetic Spectrum
- Photoelectric Effect
- Planck's Constant

Electromagnetic Spectrum

The electromagnetic spectrum depicts different frequencies of electromagnetic radiations shown from blue to red. On the electromagnetic spectrum, wavelength is shown to be increasing to the right and frequency is shown to be increasing to the left. The radiations in the order from blue to red on the electromagnetic spectrum are gamma, X-ray, UV, visible, IR, microwaves and radio waves with gamma being the smallest and radio waves being the biggest.

Understanding the different parts of the electromagnetic spectrum.

The photoelectric effect is a tool that we use to determine how much energy electrons have. The photoelectric effect was explained by Albert Einstein in 1905 and states that when light shines on metal in a vacuum, it emits electrons. We are able to determine how much energy electrons have by using the formula Kmax = h(f - f).

An explanation of photoelectric effect and how to determine how much energy electrons have.

Planck's Constant

Planck's constant, abbreviated h, is the ratio of photon energy to the frequency. Planck's constant is used in the blackbody radiation spectrum, which indicates that energy is carried by light in discrete amounts. Planck's constant is also used when calculating the photoelectric effect.

Understanding and solving problems using Planck's constant.

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