The person who first explained the discrete hydrogen atom spectrum was

a. Max Planck.
b. Albert Einstein.
c. Neils Bohr.
d. Erwin Schrödinger.
e. Werner Heisenberg.


c

Physics & Space Science

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A(n) ______ website structure works well for catalogs and other websites that use search features or dynamic content.

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On a sphere, the interior angles of a triangle add up to ________ 180 degrees

Fill in the blank(s) with correct word

Physics & Space Science

Which of the following methods used to determine the mass of a cluster of galaxies does not depend on Newton's law of gravity?

A) measuring the amount of distortion caused by a gravitational lens B) measuring the temperature of X-ray gas in the intracluster medium C) measuring the orbital velocities of galaxies in the cluster D) none of the above

Physics & Space Science

Light is emitted by hydrogen atoms in the visible range for a hydrogen atom. Its wavelength is 656 nm. What value of n is associated with the light? (RH = 1.097 × 10^7 m?1)

a. 5 b. 2 c. 4 d. 3 e. 6

Physics & Space Science