This diagram shows two energy levels in an atom. The lower level is "full" because it already has an electron with spin up and another with spin down. Therefore, a third electron must go into the higher energy level. What law or principle explains why?
A) the exclusion principle
B) the uncertainty principle
C) the law of conservation of angular momentum
D) the law of conservation of energy
A) the exclusion principle
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A conducting bar slides without friction on two parallel horizontal rails 50 cm apart. The resistance of the bar and the rails is assumed to be constant and equal to 0.1 ?. A uniform magnetic field is perpendicular to the plane of the rails
A force F = 0.08 N is required to keep the bar moving at a constant speed of 0.5 m/s. What is the magnitude of the magnetic field? A) 0.1 T B) 0.25 T C) 0.36 T D) 0.54 T E) 0.93 T
Gamma rays have a very small
A) energy. B) frequency. C) mass. D) wavelength.
When an object is placed 118 cm from a thin diverging lens, its image is found to be 59 cm from the lens. The lens is removed, and replaced by a thin converging lens whose focal length has the same magnitude as the diverging lens
This second lens is at the original position of the first lens. Where is the image of the object now?
A train is traveling due south at a constant
velocity of 86 mi/h. Any unbalanced force acting on the train with respect to the Earth’s surface must be a)zero. b)directed vertically upward. c)directed toward the south. d)directed vertically downward.