Consider the following reaction. ?+ + n ? ?– + p This reaction is impossible because it violates which conservation law?
a. baryon number
b. lepton number
c. strangeness
d. charge
e. two of the above
e
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Charge in an Electric Field: A pair of charged conducting plates produces a uniform field of 12,000 N/C, directed to the right, between the plates. The separation of the plates is 40 mm. An electron is projected from plate A, directly toward plate B, with an initial speed of v0 = 2.0 × 107 m/s. What is the speed of the electron as it strikes plate B? (e = 1.6 × 10-19 C, melectron = 9.11 × 10-31 kg) 
A. 1.2 × 107 m/s B. 1.5 × 107 m/s C. 1.8 × 107 m/s D. 2.1 × 107 m/s E. 2.4 × 107 m/s
A hypothetical particle has a mass of 510 MeV/c2. If such a particle at rest decays into two gamma-ray photons, what is the wavelength of each photon? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J? s)
What will be an ideal response?
Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. The edges of the two mirrors meet at a 30° angle. A light ray that enters parallel to mirror 2 reflects from mirror 1 and then from mirror 2 . The angle of reflection of that ray from mirror 2 is
a. 0°. b. 30°. c. 60°. d. 90°. e. 120°.
Computer simulations of the early universe clearly show the process of ________ of smaller galaxies into larger ones
Fill in the blank(s) with correct word