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angle of incidence

Overview page. Subjects: Science and Mathematics.

The angle between an incident ray or wave and the normal to a reflecting or refracting surface. The angle of incidence is related to the angle of refraction by Snell's law. See also...

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angstrom

Overview page. Subjects: Science and Mathematics.

Unit of length equal to 10-10 m, used in measuring electromagnetic radiation including visible light and X-rays. Replaced in SI units by the nanometre (10 Å = 1 nm).

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Anders Jonas Angström

Overview page. Subjects: Science and Mathematics.

(1814–74) Swedish astronomer and physicist

who became professor of physics at the University of Uppsala from 1858 until his death. He worked mainly with emission spectra,...

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angular momentum

Overview page. Subjects: Science and Mathematics.

Symbol L. The product of the angular velocity of a body and its moment of inertia about the axis of rotation, i.e. L = Iω.

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antinuclear movement

Overview page. Subjects: Science and Mathematics.

From their inception nuclear weapons were controversial, and this ambivalence extended to their civilian counterpart, nuclear reactors, because of the dangers associated with them.

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antiscience

Overview page. Subjects: Science and Mathematics.

Is a phantom phenomenon.

There are no self-described anti-scientists or degrees in antiscience. Even the most anti-modernist movements oppose science in the name of a better...

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apparatus

Overview page. Subjects: Science and Mathematics.

The terms “apparatus” and “instrument” have not been used consistently by scientific practitioners. At the root of “apparatus” is the notion of “preparing” or “making ready”; as the...

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Kenneth Appel

Overview page. Subjects: Science and Mathematics.

(1932– ) American mathematician

Appel, who was born in Brooklyn, New York City, was educated at the University of Michigan, where he completed his PhD in 1959. After working for...

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apogee

Overview page. Subjects: Science and Mathematics.

The point of the orbit of the Moon or an artificial satellite at which it is farthest from the Earth. Compare perigee.

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albedo

Overview page. Subjects: Science and Mathematics.

Reflectivity, indexed by the proportion of incident light that an object reflects. [From Latin albedo whiteness, from albus white]

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