Which of the following statements about comets and asteroids is true?
A) All asteroids lie in the asteroid belt between Mars and Jupiter.
B) Only asteroids collide with Earth.
C) There are about 1 million known asteroids in the solar system.
D) Most of the trillions of comets in our solar system have tails.
E) Comets are balls of ice and dust.
E
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An ambulance is generating a siren sound at a frequency of 2,400 Hz. The velocity of sound is 345.0 m/s. If the ambulance is traveling at a velocity of 24.00 m/s away from the stationary observer, then what is the frequency of the siren perceived by the observer?
A. 2,375 Hz B. 2,306 Hz C. 2,266 Hz D. 2,244 Hz E. 2,210 Hz
Which object is likely to be the coldest? The object whose light spectrum is brightest in the
The source of the earth's magnetic field is thought to be due to the motion of charged particles in the earth's
A) mantle. B) crust. C) inner core. D) outer core. E) mantle & crust.
A helium-neon laser emits red light having a wavelength of 632.8 nm and a power of 1.85 mW. How many photons are emitted each second? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, and 1 nm = 10?9 m)
a. 5.9E+15 b. 3.7E+34 c. 5.9E+24 d. 5.9E+18 e. 1.2E+17