chapter 9 vocab
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| electromagnetic wave | A wave that can transfer electric and magnetic energy through the vacuum of space.
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| electromagnetic radiation | The energy transferred through space by electromagnetic waves.
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| wavelength | The distance between the crest of one wave and the crest of the next wave.
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| frequency | The number of complete waves that pass a given point in a certain amount of time.
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| electromagnetic spectrum | The complete range of electromagnetic waves placed in order of increasing frequency.
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| radio waves | Electromagnetic waves with the longest wavelengths and lowest frequencies.
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| microwaves | Electromagnetic waves that have shorter wavelengths and higher frequencies than radio waves.
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| infrared rays | Electromagnetic waves with shorter wavelengths and higher frequencies than microwaves.
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| visable light | Electromagnetic radiation that can be seen with the unaided eye.
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| ultraviolet rays | Electromagnetic waves with wavelengths shorter than visible light but longer than X-rays.
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| x-rays | Electromagnetic waves with wavelengths shorter than ultraviolet rays but longer than gamma rays.
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| gamma rays | Electromagnetic waves with the shortest wavelengths and highest frequencies.
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| ray | A straight line used to represent a light wave.
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| regular reflection | Reflection that occurs when parallel rays of light hit a smooth surface and all reflect at the same angle.
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| image | A copy of an object formed by reflected or refracted rays of light.
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| diffuse reflection | Reflection that occurs when parallel rays of light hit an uneven surface and all reflect at different angles.
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| plane mirror | A flat mirror that produces an upright, virtual image the same size as the object.
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| virtual image | An upright image formed where rays of light appear to come from.
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| concave mirror | A mirror with a surface that curves inward.
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| optical axis | An imaginary line that divides a mirror in half.
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| focal point | The point at which light rays parallel to the optical axis meet, or appear to meet, after being reflected (or refracted) by a mirror (or a lens).
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| real image | An upside-down image formed where rays of light meet.
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| convex mirror | A mirror with a surface that curves outward.
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| index of refraction | A measure of the amount a ray of light bends when it passes from one medium to another.
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| mirage | An image of a distant object caused by refraction of light as it travels through air of varying temperature.
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| lens | 1. The flexible structure that focuses light that has entered the eye. 2. A curved piece of glass or other transparent material that is used to refract light.
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| concave lens | A lens that is thinner in the center than at the edges.
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| convex lens | A lens that is thicker in the center than at the edges.
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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