travels to Aphe Centaun over s length that is shorter than four light years, c.
ID: 2306108 • Letter: T
Question
travels to Aphe Centaun over s length that is shorter than four light years, c. cocks on Larth ?nd or Alpha Centauri are synchronized. D. Alpha Centaun travel 21 A train is 200 feet lona in its platform so fast that, in the plattorm's frame, the trein and pl is to James over a length that is shorter thsan four light yaars. own frame, and s raroad plstterm is 160 feat lang in its cwn freme. The train rushes past the atform are the same length. Haw fast was the train moving? of the following about the g amma ray is true? A. It carnes a positives charge. B. t carriee & nagative charge C. It can be deflected by a magnetic field. D. It can be denected by an electric feld E. It has zero rest mass and a neutral charge 23. A spaceship carrying a light ckock movns at a speed ot 0.96c relatve to an observer on Earth Relative to a trame of reterence that is fixed with respect to the carth, how long dces it take the clock to advance 15? A) 0.96 s B) 5.835 C) 1.22 s D) 259 s E) 3 575 24. The electron charge was measured for the first time in the (A) Cathede ray experiment (C) Ol drop experiment. E) Compton effect expeniment 25. An electron inside a hydrogen atom is confined to within a space of about 0.110 nm. li the electron mass is 9.11 x 10-31 kg. what is the uncertainty in the clectron's velocily? (B) Photcekectric offiecl experiment (D) Electron disi raction from aluminum To A) 1.50 x 106 m's B) 1.05 x 106 m/s C) 1.05 x 1010 m's D) 1.05 x 108 m/s E) 1.50 x 108 m'sExplanation / Answer
25) according to heisenberg uncertainity principle
m del V * del x = h/2 pi
9.11*10^-31*del V * 0.11*10^-9 = 6.626*10^-34 / 2 pi
del V = 1.05*10^6 m/s
so option B) 1.05*10^6 m/s is the correct answer
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