Ocean waves refract due to
A) wave interference.
B) ocean swells.
C) shallow water.
D) transverse motion.
Answer: C
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Which of the following physical parameters is NOT under the control of a radio telescope?
A) the direction pointed on the sky B) the bandwidth C) the time of observation D) the band
A perfectly black sphere 18.0 cm in diameter is held at a temperature of 215°C
(? = 5.670 × 10-8 W/m2 ? K4, Wien displacement law constant is 2.90 × 10-3 m ? K, h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s) (a) Near what wavelength does this sphere radiate most strongly? (b) If all the radiated energy were at the wavelength found in part (a), how many photons would the sphere emit each second?
In a plane wave, the wavefronts are
a. circular b. flat c. parallel d. perpendicular to the direction of propagation
When can radio telescope be used?
What will be an ideal response?