A magnifying lens with a focal length of 30.0 cm has what maximum magnification? (Assume the near point is 25 cm)
a. 2.2
b. 0.8
c. 31.0
d. 1.8
e. 30.0
d
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Energy in Nuclear Reactions: 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)
Fill in the blank(s) with the appropriate word(s).
A ball is thrown with a velocity of 40 m/s at an angle of 30° above the horizontal and attains a certain range R. At what other angle will this ball attain the same range keeping its initial velocity the same?
A) 15° B) 90° C) 120° D) 60° E) All other angles will give different ranges.
According to Copernicus, retrograde motion for Venus must occur around
A) greatest elongation, when the planet is farthest from the Sun. B) inferior conjunction, when it passes between us and the Sun. C) superior conjunction, when the planet is on the far side of the Sun. D) quadrature, when the planet is 90 degrees away from the Sun. E) opposition, when the planet lies opposite the Sun in the sky.
The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a0 = 0.529 × 10^-10 m. The electric potential created by the proton at the position of the electron is
a. -13.6 V. b. +13.6 V. c. -27.2 V. d. +27.2 V. e. +5.12 × 10^9 V.