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
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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
On a sphere, the interior angles of a triangle add up to ________ 180 degrees
Fill in the blank(s) with correct word
A(n) ______ website structure works well for catalogs and other websites that use search features or dynamic content.
A. hierarchical B. webbed C. linear D. structured
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