An object is placed exactly halfway between the Earth and the Moon. The object will fall toward the

A) Earth.
B) Moon.
C) neither

Answer: A

Physics & Space Science

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Which best describes the surface of Callisto?

a. dark and dirty ice, heavily pocked with craters b. old and dark on some portion, but cratered with a young bright grooved terrain c. icy crust free of craters with a liquid water ocean beneath d. covered in active sulfur-based volcanoes e. mostly water ice mixed with methane

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From shortest to longest wavelength, which of the following correctly orders the different categories of electromagnetic radiation?

A) infrared, visible light, ultraviolet, X-rays, gamma rays, radio
B) radio, infrared, visible light, ultraviolet, X-rays, gamma rays
C) visible light, infrared, X-rays, ultraviolet, gamma rays, radio
D) gamma rays, X-rays, ultraviolet, visible light, infrared, radio
E) gamma rays, X-rays, visible light, ultraviolet, infrared, radio

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Physics & Space Science

What is coherent light?

a. light of a single wavelength b. light that is all in phase c. light that is polarized in one direction d. none of the above

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A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with a frequency of 39.6 kHz

A car is approaching him at a speed of 35.0 m/s. The wave is reflected by the car and interferes with the emitted sound producing beats. What is the frequency of the beats when the speed of sound in air is 343 m/s? A) 5000 Hz B) 4500 Hz C) 8490 Hz D) 9000 Hz E) 4250 Hz

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Physics & Space Science