Accretion is
a. the adding of material to an object an atom or molecule at a time.
b. the adding of material to an object by collection of solid particles.
c. the release of gas from rocks as they are heated.
d. the largest of the Galilean satellites.
e. caused by the bombardment of the solar wind.
B
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Photoelectric Effect: A photocathode having a work function of 2.8 eV is illuminated with monochromatic electromagnetic radiation whose photon energy is 4.0 eV. What is the threshold (cutoff) frequency for photoelectron production? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 6.8 × 1014 Hz B. 2.9 × 1014 Hz C. 7.7 × 1014 Hz D. 8.6 × 1014 Hz E. 9.7 × 1014 Hz
As the wavelength of light increases, its energy ________.
A. decreases B. remains constant C. moves more slowly D. increases E. moves more quickly
A 5-kg fish swimming at a speed of 1 m/s swallows an absent-minded 1-kg fish at rest. The speed of the larger fish after lunch is
A) 1/2 m/s. B) 2/5 m/s. C) 5/6 m/s. D) 6/5 m/s. E) 1 m/s.
An aircraft approaches a runway that runs directly east as a strong wind blows out of the south. The direction that the aircraft should aim in order to land is east of north
a. True b. False Indicate whether the statement is true or false