A surface has a work function 1.70 eV and has light of wavelength 400 nm shone on it. What is the kinetic energy of the photoelectrons emitted?
A)
4.52 eV
B)
3.11 eV
C)
1.41 eV
D)
2.82 eV
E)
1.70 eV
C
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Why does Mars have seasons?
a) Mars has an atmosphere which deteriorates and regenerates on a yearly cycle. b) It rotates only a few times during each orbit around the Sun. c) Mars has a very elliptical orbit that brings it very close to the Sun during summer,and far from the Sun during winter. d) Its orbit is circular. e) Its axis is tilted relative to its orbital plane.
A 100-g sample of a certain substance undergoes a transformation of some kind that releases 20,000 J of energy. What kind of transformation is this likely to be?
A. A temperature change B. A phase change C. A chemical reaction D. A nuclear reaction E. It is impossible to guess.
A 50.0-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 26.0° below the horizontal is applied to the box
What is the minimum coefficient of static friction between the box and the surface required for the box to remain stationary? A) 0.441 B) 0.654 C) 0.375 D) 0.866 E) 0.406
In a Newton's rings apparatus, the interference effect observed between the rays occurs because of the path difference between
A) the top and bottom surfaces of the top piece of glass. B) the top and bottom surfaces of the bottom piece of glass. C) the top and bottom surfaces of the air between the pieces of glass. D) the top and bottom surfaces of the oil between the pieces of glass. E) the top surfaces between the top and bottom pieces of glass.