What is the simplest way we might detect life on an extrasolar planet?
A) listen for radio signals coming from an advanced civilization on the planet
B) wait for aliens from the planet to visit us
C) analyze the spectrum of reflected light from the planet
D) send an interstellar probe to the planetary system
C
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When a light wave enters into a medium of different optical density,
A) only its speed changes. B) its speed and frequency change. C) its speed and wavelength change. D) its frequency and wavelength change. E) its speed, frequency, and wavelength change.
If air resistance can be ignored, which of the following graphs will be a straight line for a falling object?
A. Distance travelled versus velocity B. Velocity versus time C. Velocity versus distance travelled D. Distance travelled versus time E. Time versus distance travelled
Light of wavelength 6.9 × 10^?7 m has an energy of: (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s)
a. 2.9E–19 J b. 9.6E–20 J c. 3.1E–19 J d. 4.3E–20 J e. 3.2E–20 J
If there are 146 neutrons in 238U, how many neutrons are found in the nucleus of 235U?
a. 141 b. 143 c. 145 d. 147