If 3.0 × 1015 electrons flow through a section of a wire of diameter 2.0 mm in 4.0 s, what is the current through the wire? (e = 1.60 × 10-19 C)
A) 0.12 mA
B) 0.24 mA
C) 7.5 × 107 A
D) 7.5 × 1014 A
A
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Light shines through atomic hydrogen gas. It is seen that the gas absorbs light readily at a wavelength of 91.63 nm
What is the value of n of the level to which the hydrogen is being excited by the absorption of light of this wavelength? Assume that the most of the atoms in the gas are in the lowest level. (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, the Rydberg constant is R = 1.097 × 107 m-1) A) 14 B) 16 C) 11 D) 21
A proton is accelerated from rest through a potential difference of 2.5 kV and then moves perpendicularly through a uniform 0.60-T magnetic field. What is the radius of the resulting path?
a. 15 mm b. 12 mm c. 18 mm d. 24 mm e. 8.5 mm
In chromatic aberration the focal length for violet light is
A. The same as for red light B. Longer than red light C. Shorter than red light D. Depends on the light source.
Assume that a uniform magnetic field is directed into this page. If an electron is released with an initial velocity directed from the bottom edge to the top edge of the page, which of the following describes the direction of the resultant force acting on the electron?
a. out of the page b. to the right c. to the left d. into the page