The light that comes from a ruby laser has a wavelength of 694.3 nm.
(a) What is the color of the laser light?
(b) What is the energy of a photon from a ruby laser in air in joules and in electron volts?
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Professional astronomical telescopes generally have a much greater magnification than the telescopes you can buy in stores
Indicate whether the statement is true or false
Earth materials that have been deposited by running water are called _______
Fill in the blank(s) with the appropriate word(s).
When someone on Earth observes the Moon in the first-quarter phase, someone on the Moon facing Earth observes Earth in the
A) crescent Earth phase. B) third-quarter Earth phase. C) new Earth phase. D) first-quarter Earth phase. E) full Earth phase.
The helium flash increases the star's luminosity
Indicate whether the statement is true or false