A student is performing an experiment comparing sound and light waves. The student gathers the following data.
What conclusion does the student most likely make based
on this data?
Medium
Speed of Sound
Temperature
(°C)
0
25
100
Ice
Water
Steam
Speed of
Sound (m/s)
3200 m/s
1500 m/s
346 m/s
O Light waves always travel the same speed; however, the
speed of sound is determined by the medium that it
travels through
O All sound waves always have the same energy, so the
temperature of the medium does not affect wave speed
O Light needs to vibrate particles, so it travels fastest in
tightly packed solids, while sound does not need a
medium, so it travels fastest in a gas
O Tightly packed particles in solids slow down the light
waves, however, sound waves make particles bounce
into each other, so they travel faster in solids.
Medium
Speed of Light
Index of
Refraction
1.00
1.33
1.57
Air
Water
Glass
Speed of Light
(m/s)
2.99 x 10
2.26 x 10
1.91 x 108
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To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field.it is in the opposite direction from that of the original external field.it has a direction determined entirely by the charge on its surface.it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0