What is the maximum kinetic energy (in eV) of a photoelectron emitted from a surface whose work function is 5.0 eV when illuminated by a light whose wavelength is 200 nm?
a. 1.9
b. 1.2
c. 3.1
d. zero
e. 6.2
b
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Which of the following statements about scientific models is true?
What will be an ideal response?
A unified model of active galaxy cores can explain different types of Seyfert galaxies, quasars and other active galaxy types by differences in the ____
a. mass of the supermassive black hole b. size and thickness of the accretion disk c. magnetic flux strength in the jets d. amount of dust in the accretion disk e. tilt of the accretion disk to the line of sight
A mass of 355 g hangs from one end of a string that goes over a pulley with a moment of inertia of 0.0125 kg?m2 and a radius of 15.0 cm. A mass of 680 g hangs from the other end
When the masses are released, the larger mass accelerates downward, the lighter mass accelerates upward, and the pulley turns without the string slipping on the pulley. What is the acceleration of the masses? A) 2.00 m/s2 B) 3.82 m/s2 C) 2.87 m/s2 D) 5.74 m/s2 E) 7.78 m/s2
Which part of the electromagnetic spectrum generally gives us our best views of stars forming in dusty clouds?
A) infrared B) ultraviolet C) visible light D) blue light