Which seismic wave type travels the fastest?
Ans: Primary waves
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Which of the following is an example of a galaxy?
A) The Canopus Galaxy B) The Milky Way Galaxy C) The Proxima Centauri Galaxy D) The Alpha Centauri Galaxy
In a star, the condition of balance between the inward force of gravity and the outward force of thermal and radiation pressure is known as _______________ equilibrium
a. hydrostatic b. thermal c. photostatic d. magnetostatic
What is needed, in addition to the parts of the Bohr model used to calculate the energies of a hydrogen atom, to understand the periodicity of the elements?
a. An understanding of the photoelectric effect. b. The calculated radii of the orbits in which electrons move. c. The principle that alkali metals (in the column of the Periodic Table containing lithium, sodium, potassium, etc.) have their outer shell of electrons filled. d. The principle that atoms have shells that each hold a certain number of electrons, with filled shells being the most stable. e. The principle that the noble gas elements accept electrons easily from other atoms.
In the scattering of a photon striking an electron at rest, the energy of the incident photon is equal to the energy of scattered photon minus the final kinetic energy of the electron
Indicate whether the statement is true or false