Binary stars separated enough to be resolved in a telescope are called
A) visual binaries.
B) orbital binaries.
C) astrometric binaries.
D) spectroscopic binaries.
E) line-of-sight binaries.
A
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Which portion of the electromagnetic spectrum is used to sterilize medical instruments?
a. infrared waves b. microwaves c. X rays d. ultraviolet light
In analyzing electric circuits containing a battery and at least one resistor, what is the change in potential across a resistor as one moves through it in the direction of the current?
a) +i²R b) -i²R c) +iR d) -iR e) zero
A charge of 18 nC is uniformly distributed along the y axis from y = 3 m to y = 5 m. Which of the following integrals is correct for the electric potential (relative to zero at infinity) at the point x = +2 m on the x axis?
A.
B.
C.
D.
E.
A musical tone, sounded on a piano, has a frequency of 820 Hz and a wavelength in air of 0.400 m. What is the wave speed?
a. 587 m/s c. 235 m/s b. 328 m/s d. 170 m/s