A(n) ____________________ uses a mirror as its objective
Fill in the blank(s) with correct word
reflecting telescope
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There is a current I flowing in a clockwise direction in a square loop of wire that is in the plane of the paper. If the magnetic field B is toward the right, and if each side of the loop has length L, then the net magnetic torque acting on the loop is
a.
2ILB.
b.
ILB.
c.
IBL2.
d.
zero.
A planar cross section through two spherical waves emanating from the sources S1 and S2 in the plane is shown in the figure. The black circles are one and two wavelengths from their respective sources. The lighter circles are one-half and one-and-a-half wavelengths distant from their respective sources. If the phase at S1 and S2 is zero at this instant, and the waves shown arriving at P2 both arrive with amplitude A, the difference in phase angle at point P2 (in radians) is
?
?
A. 0. B. ?/2. C. ?. D. 3?/2. E. 2?.
Since 1983 the standard meter has been defined in terms of which of the following?
a. specific alloy bar housed at Sevres, France b. wavelength of light emitted by krypton-86 c. distance from the Earth's equator to the North Pole d. the distance light travels in a certain fraction of a second e. None of the above
If a star has a parallax of .005", then its distance is ________ light-years
Fill in the blank(s) with correct word