_______________ 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

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science