Let's say that the magnitude of a particle's displacement is 2 m. Which of the following values could represent the distance traveled?
(i) 0 m
(ii) 1 m
(iii) 2 m
(iv) 3 m
1.(iii) and (iv)
2.(ii), (iii), and (iv)
3.(i) and (ii)
4.all of them
1
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A filament of tungsten wire is 0.001 m in diameter, and the filament is heated to 2500 K. The work function of tungsten is 4.5 eV.
(a) Calculate the probability of electrons having sufficient energy to be emitted from the filament. (b) Calculate the emission current density from the tungsten wire. (c) What length of wire can produce a thermionic electron current of 1 A?
The glare seen from water is largely
A) horizontally polarized. B) vertically polarized. C) unpolarized.
A student is studying a Fraunhofer diffraction pattern. She measures the distance between the center of one dark fringe and the center of the next dark fringe some small distance from the central maximum, and finds them to be 4 mm apart. To get a high grade on her lab, she should predict that the distance between the dark fringes on either side of the central maximum will be
1.4 mm. 2.2 mm. 3.8 mm. 4.not enough information to predict.
A 3.0-kg object moving 8.0 m/s in the positive x direction has a one-dimensional elastic collision with an object (mass = M) initially at rest. After the collision the object of unknown mass has a velocity of 6.0 m/s in the positive x direction. What is M?
a. 7.5 kg b. 5.0 kg c. 6.0 kg d. 4.2 kg e. 8.0 kg