Doppler radar is replacing conventional radar in weather forecasting because
a. it can measure wind speeds.
b. Doppler radar is widely used in police cars.
c. it is cheaper.
d. government agencies are required to use the latest equipment.
a
You might also like to view...
What nuclear fusion mechanism does an isolated white dwarf use to generate energy?
a. Proton-proton chain b. CNO cycle c. Triple alpha process d. White dwarfs don't generate their own energy.
This figure shows observations that have allowed astronomers to determine the orbits of several stars around Sgr A* (the central object). What can we learn about Sgr A* by analyzing these orbits?
A) its mass B) its age C) its chemical composition D) all of the above
A diffraction grating with 4000 lines/cm is illuminated by light from the sun. The solar spectrum is spread out on a white wall across the room. At what angle from the center line does blue light (400 nm) appear? At what angle from the center line does red light (650 nm) appear?
A light beam from a 2.1-mW He-Ne laser has a wavelength of 633 nm. How many photons does the laser emit in one second?
(h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s) A) 1.3 × 1016 B) 6.7 × 1015 C) 8.8 × 1015 D) 1.1 × 1016