Photoelectric Effect Using Stopping Potential: When a photoelectric surface is illuminated with light of wavelength 437 nm, the stopping potential is measured to be 1.67 V. (1 eV = 1.60 × 10-19 J, e = 1.60 × 10-19 C, melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)(a) What is the work function of the metal, in eV?(b) What is the maximum speed of the ejected electrons?
What will be an ideal response?
(a) 1.17 eV (b) 7.66 × 105 m/s
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Modern day living stromatolites which resemble ancient stromatolites very closely have been found in
A) the Yucatan peninsula, Mexico B) South West Greenland C) Western Australia D) Yellowstone National Park, U.S.A.
A plane flies directly from city A to city B, which are separated by 2300 mi. From A to B, the plane flies into a 65 mi/h headwind. On the return trip from B to A, the wind velocity is unchanged
The trip from B to A takes less than the trip from A to B. What is the airspeed (assumed constant) of the plane relative to the air (that is, the airspeed)? A) 530 mi/h B) 610 mi/h C) 480 mi/h D) 400 mi/h
Consider the segment of cylindrical metal wire shown below. Note that the drift speed of electrons is increasing in the wire as we move to the right. Assume that charge cannot move off the wire. The total charge between the two cross-sectional areas A and B is
A. Increasing.
B. Decreasing.
C. Remaining the same.
Why is Earth's continental crust lower in density than seafloor crust?
A) Continental crust is made as the lowest-density seafloor crust melts and erupts to the surface near subduction zones. B) Continental crust is made from the volcanic rock called basalt. C) Continental crust comes from volcanoes, while seafloor crust comes from geysers. D) Continental crust comes from Earth's inner core, while seafloor crust comes from the outer core.