How does the nature of radio waves allow a radio telescope to use a wire mesh surface?
What will be an ideal response?
Because radio wavelengths are in the range of a few millimeters to a few tens of meters, a radio telescope dish only needs to be shaped to that level of accuracy, much less smooth than a good optical telescope. Wire mesh works well as a mirror for all the but the shortest-wavelength radio waves.
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A coil is rotated in a magnetic field about an axis perpendicular to the field. During each rotation, how many times does the flux through the coil equal zero?
A. 0 B. 1 C. 2 D. 4 E. more than 4
An ideal gas is allowed to expand adiabatically. Assume the process is reversible. What is the change in entropy?
A. 0 B. nR ln (V2/V1) C. nR ln (T2/T1) D. kn ln (V2/V1) E. kn ln (T2/T1)
If an element has 15 protons and 16 neutrons and 15 electrons, what is the mass number of the element?
A) 31 B) 15 C) 16 D) 30 E) none of the above
The transit method of planet detection works best for
A) big planets in face-on orbits around small stars. B) big planets in edge-on orbits around small stars. C) Earth-like planets in any orbit. D) small planets in face-on orbits around big stars. E) small planets in edge-on orbits around big stars.