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Seismic wave: Quiz


Question 1: This effect is similar to the refraction of ________.

Question 2: The propagation velocity of the waves depends on ________ and elasticity of the medium which is penetrated.

Question 3: In air, these pressure waves take the form of sound waves, hence they travel at the ________.
Acoustic impedanceHeliumSpecific heat capacitySpeed of sound

Question 4: The existence of these waves was predicted by John William Strutt, ________, in 1885.
John Strutt, 3rd Baron RayleighWilhelm RöntgenWilliam Henry BraggJ. J. Thomson

Question 5: ________ in the planet increases with depth, which would slow the waves, but the modulus of the rock increases much more, so deeper means faster.

Question 6: Typical speeds are 330 m/s in air, 1450 m/s in water and about 5000 m/s in ________.
BasaltIgneous rockFelsicGranite

Question 7: Seismic waves are studied by seismologists, and measured by a ________, which records the output of a seismometer, or geophone.
EarthquakeZhang HengReflection seismologySeismometer

Question 8: They follow raypaths refracted by the varying ________ and modulus (stiffness) of the Earth's interior.

Question 9: This kind of observation has also been used to argue, by seismic testing, that the ________ has a solid core, although recent geodetic studies suggest the core is still molten[citation needed].
Io (moon)Mercury (planet)MoonGanymede (moon)

Question 10: Seismic waves are waves of force that travel through the ________ or other elastic bodies, for example as a result of an earthquake, explosion, or some other process that imparts forces.


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