A light beam with wavelength 440 nm in a certain material then enters air and its wavelength becomes 577 nm
(a) What is the index of refraction for the material?
(b) At what angle with the plane of the surface will the light be totally reflected back into the material?
(a) 1.31 (b) 40.3°
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Car A rear ends Car B, which has twice the mass of A, on an icy road at a speed low enough so that the collision is essentially elastic. Car B is stopped at a light when it is struck. Car A has mass m and speed v before the collision. After the collision
A. each car has half the momentum. B. car A stops and car B has momentum mv. C. car A stops and car B has momentum 2mv. D. the momentum of car B is four times as great in magnitude as that of car A. E. each car has half of the kinetic energy.
The inner planets are composed of ____
a. rock and ice b. ice and gas c. rock and gas d. metal and ice e. rock and metal
Coherent sources of light have a varying phase difference
Indicate whether the statement is true or false
A current-carrying ohmic metal wire has a cross-sectional area that gradually becomes smaller from one end of the wire to the other. The current has the same value for each section of the wire, so charge does not accumulate at any one point. How does the drift speed vary along the wire as the area becomes smaller?
1.It increases. 2.It decreases. 3.It remains constant.