Gamma rays are photons with very high energy. What is the wavelength of a gamma-ray photon with energy 7.7 × 10-13 J? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 3.1 × 10-13 m B) 3.5 × 10-13 m C) 3.9 × 10-13 m D) 2.6 × 10-13 m
D
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What is the kinetic energy of a proton moving at 0.8000 c? The rest energy of a proton is 938.3 MeV.
A. 1564 MeV B. 1251 MeV C. 938.3 MeV D. 2502 MeV E. 626.0 MeV
The scientific consensus concerning fusion power reactors is that
A) the first commercial fusion reactors are already under construction and will be ready for use within ten years. B) such reactors are already a source of commercially feasible electric power. C) such reactors could be commercially feasible, but not until the middle of this century. D) according to present scientific knowledge, it is impossible to build such reactors. E) such reactors could be built but they will never be a commercially feasible source of electricity.
Charge of uniform density 90 nC/m3 is distributed throughout the inside of a long nonconducting cylindrical rod (radius = 2.0 cm). Determine the magnitude of the potential difference of point A (2.0 cm from the axis of the rod) and point B (4.0 cm from the axis)
a. 1.9 V b. 1.4 V c. 2.2 V d. 2.8 V e. 4.0 V
Which of the following is not an allotropic form of carbon?
(a) Ethylene (b) Diamond (c) Buckyball (d) Graphene