Describe the two different kinds of seismic waves. Distinguish between them by describing how they move through Earth's interior
What will be an ideal response?
S-waves cause side-to-side motion. These waves cannot travel through liquid, so they do not make it through Earth's liquid outer core. P-waves vibrate the material through which they pass back and forth along the direction of travel of the wave. P-waves go a little faster than S-waves. Also P-waves can travel through liquid so these can be seen on the other side of the planet from the earthquake source.
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A 100-kW radio station emits EM waves in all directions from an antenna on top of a mountain. What is the intensity of the signal at a distance of 10 km?
a. 8 × 10^-5 W/m2 b. 8 × 10^-6 W/m2 c. 3 × 10^-3 W/m2 d. 0.8 W/m2 e. 2.5 × 10^-5 W/m2
A piece of chocolate melts in your mouth. This is an example of
a. heat conduction b. heat convection c. heat radiation d. thermal expansion e. none of the above
One of the most likely places an advanced civilization might leave an artifact for us to find would be
A) in the desert of Roswell, New Mexico B) the L4 and L5 points in the Earth—Moon system C) in the Cydonia region of Mars D) on the far side of the Moon
Seen from the northern latitudes (mid-northern hemisphere), the star Polaris
a. is never above the horizon during the day. b. always sets directly in the west. c. is always above the northern horizon. d. is never visible during the winter. e. is the brightest star in the sky.