What wavelength monochromatic source in the visible region (390 to 710 nm) can be used to constructively reflect off a soap film (n = 1.46) if the film is 78.0 nm thick?
a. 467 nm
b. 386 nm
c. 456 nm
d. 404 nm
e. 499 nm
c
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Name the three main types of active galaxies.
A. Seyfert, radio, and quasar B. spiral, elliptical, and irregular C. barred spiral, irregular, and Seyfert D. old, young, and intermediate
Is it possible to add energy to an isolated material and not have the material's temperature change?
1.No, the material's temperature will always go up when energy is added to it. 2.No, the material's temperature will sometimes go up and sometimes go down when energy is added, but it will always change. 3.Yes, temperature change is not a function of energy added to a material. 4.Yes, in some cases a material's temperature will change when energy is added to the material. In other cases, the material's temperature will not change when energy is added.
The focal length of the objective lens of a telescope is 75.0 cm, and the eyepiece has a focal length of 6.00 cm. What is the magnification of this telescope?
A) 0.0800 B) 0.645 C) 450 D) 12.5 E) 200
At a point in space where the magnetic field is measured, the magnetic field produced by a current element
a. points radially away in the direction from the current element to the point in space. b. points radially in the direction from the point in space towards the current element. c. points in a direction parallel to the current element. d. points in a direction parallel to but opposite in direction to the current element. e. points in a direction that is perpendicular to the current element and perpendicular to the radial direction.