Neglecting recoil of the gold nucleus, how much kinetic energy must an alpha particle (charge = 2 × 1.6 × 10^–19 C) have to approach to within 5.70 × 10^?14 m of a gold nucleus (charge = 79 × 1.6 × 10^?19 C)? (ke = 8.99 × 10^9 N?m2/C2 and 1 MeV = 1.6 × 10^?13 J)
a. 4.4E–10 MeV
b. 1.1E+1 MeV
c. 2.0E+0 MeV
d. 4.0E+0 MeV
e. 5.0E–2 MeV
d
You might also like to view...
Why did these astronomers take so many different pictures of the same patch of sky?
A: To "top" a previous study by rival astronomers, who took slightly fewer images. B: Galaxies have brightnesses that vary over hours or days, and they needed to be sure to get roughly equal light from all of them. C: To average over many images and keep only the consistent object details, filtering out random single-exposure events like charged particles from the solar wind. D: Needed a separate image for every nanometer-increment wavelength from 350nm to 800nm, to compile the final full-color image. E: It's not NASA's fault that pulsar in the foreground kept blinking!
A ball is thrown vertically upward with an initial speed of 20 m/s. Two seconds later, a stone is thrown vertically (from the same initial height as the ball) with an initial speed of 24 m/s. At what height above the release point will the ball and stone pass each other?
a. 17 m b. 21 m c. 18 m d. 27 m e. 31 m
The fundamental frequency of a above middle C on the piano is 440 Hz. This is the tenor high A, but a convenient note in the mid-range of women's voices. When we calculate the wavelength, we find that it is
a. much shorter than the length of either a man's or woman's lips. b. shorter than the length of a man's lips, but about the length of a woman's lips. c. longer than a woman's lips, but about the length of a man's lips. d. much longer than the length of either a man's or a woman's lips. e. about the same length as either a man's or woman's lips.
Drumlins are made of
A) bedrock. B) ice. C) drift. D) striations.