_______________ theoretical assumptions on quantization overcame the difficulty with a major problem with understanding blackbody radiation.
A. Hertz's
B. Planck's
C. Einstein's
D. Maxwell's
E. Bohr's
B. Planck's
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____________ pushed gas and dust particles out of the solar nebula by the light from the Sun
a. Radiation pressure b. Outgassing c. Condensation d. Accretion e. Differentiation
What is a pulsar?
A) a star that alternately expands and contracts in size B) a rapidly rotating neutron star C) a neutron star or black hole that happens to be in a binary system D) a binary system that happens to be aligned so that one star periodically eclipses the other E) a star that is burning iron in its core
Plane A is flying at 600 mph in the northeast direction relative to the Earth. Plane B is flying at 500 mph in the north direction relative to the Earth. What is the direction of motion of Plane B as observed from Plane A?
a. 52.5° N of E c. 37.5° N of W b. 48.2° N of W d. 10.1° N of W
At a certain elevation, the ________ , the air becomes saturated and water-vapor molecules ________
A) lifting condensation level; condense to mark the base of cloud formation B) equilibrium level; condense to mark the base of cloud formation C) lifting condensation level; stabilize and mark the upper limit of cloud formation D) equilibrium level; stabilize and mark the upper limit of cloud formation