A metal surface has a work function of 2.50 eV
What is the longest wavelength of light that will eject electrons from the surface of this metal? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
497 nm
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Two children ride on a merry-go-round, George is at a greater distance from the axis of rotation than Jacques. It is a true statement that
A) Jacques has a greater angular velocity than George. B) Jacques and George have the same angular velocity. C) Jacques has a smaller angular velocity than George. D) both have zero angular velocities. E) Cannot tell which one has the greater angular velocity without knowing their masses.
The only particle we can directly observe coming out of the Sun's core is the ________
Fill in the blank(s) with correct word
In a photoelectric effect experiment, electrons emerge from a copper surface with a maximum kinetic energy of 1.10 eV when light shines on the surface. The work function of copper is 4.65 eV
Which one of the following values is closest to the wavelength of the light? (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J) A) 360 nm B) 150 nm C) 1100 nm D) 220 nm
Two speakers are placed side by side and driven by the same frequency of 0.50 kHz. If the distance from a person to one speaker is 5.0 m and the person detects little or no sound,
which of the following is a possible the distance from the person to the other speaker? The sound speed in the room is 340 m/s. A) 7.7 m B) 8.1 m C) 8.4 m D) 9.1 m