Define one gram atomic weight


The mass in grams of one mole of the naturally occurring atoms of an element.

Physics & Space Science

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The difference between a LED and a laser is that a LED has spontaneous photon emission, and a laser has _________photon emission.

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science

Which of the following phenomena is not commonly associated with the star-formation process?

A) intense ultraviolet radiation coming from a protostar B) the formation of a spinning disk of material around a protostar C) powerful "jets" shooting out along the rotation axis of a protostar D) strong winds of particles blowing out into space from a protostar

Physics & Space Science

The termĀ heatĀ in physics is

A. equivalent to temperature. B. equivalent to internal energy. C. the same as work. D. any energy transferred to a body that raises the temperature of the body. E. energy transferred to a body because of a difference in temperature.

Physics & Space Science

On a bright and sunny day, the intensity of solar radiation on the Earth's surface is 1 000 W/m2 . If the average wavelength of the sunlight is 500 nm, how many photons are incident on a square meter of the Earth's surface per second?

Physics & Space Science