Two pieces of optically flat glass (n = 1.50 ) touch at one edge and a separated by a thin stretched fiber at the opposite edge. Light of wavelength 500 nm is shone from above and 100 dark fringes are counted. How thick is the fiber?
A)
13 ?m
B)
100 ?m
C)
5 ?m
D)
50 ?m
E)
25 ?m
E
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Photons of light can be absorbed by an atom of an element ____
a. if they match one of several possible wavelengths that are absorbed by that element b. if they match one of several possible wavelengths that are absorbed by all elements c. if they match the only particular wavelength that can be absorbed by that element d. if they match the only particular wavelength that can be absorbed by all elements e. no matter what wavelength they have
An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, what is the direction of the magnetic field in this region?
A) along the +z-axis B) along the -z-axis C) along the -x-axis D) along the +y-axis E) along the -y-axis
A reversible engine takes in 555. Joules per second and exhausts 482. watts
(a) How much power does it produce? (b) What is its efficiency? (c) If operated in reverse as a refrigerator, what would be its COP?
How do geologists determine the relative ages of different rocks?
What will be an ideal response?