A light beam with wavelength 440. nm in a 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 surface will the beam be totally reflected back in the material?
(a) 1.31
(b) 40.3°
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Two springs, each with spring constant 33.0 N/m, are connected in parallel, and the combination is hung vertically from one end. A 18.0-N weight is then suspended from the other end of the combined spring. How far does the combined spring stretch as it comes to equilibrium?
a. 0.545 m b. 0.136 m c. 1.09 m d. 0.273 m e. 2.18 m
The radial distance to the event horizon from the singularity of a black hole is called
a. the Roche limit. b. the Schwarzschild radius. c. the Hubble unit. d. none of the above.
Charon is a moon of ______________
a. Earth b. Venus c. Neptune d. Mars e. Pluto
The electric fields arriving at a point P from three coherent sources are described by E1 = E0 sin ?t, E2 = E0 sin (?t + ?/4) and E3 = E0 sin (?t + ?/2). Assume the resultant field is represented by Ep = ER sin (?t + ?). The amplitude of the resultant wave at P is
a. E0. b. 1.5E0. c. 1.7E0. d. 2.4E0. e. 2.9E0.