Which force, exerted between an electron and a proton, is the strongest on scales much larger than an atomic nucleus?
A) strong
B) weak
C) electromagnetic
D) gravity
E) They are all equal.
C) electromagnetic
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When the Sun rises, it is located in the constellation Gemini. When the Sun sets later that same day, it will be:
A) in the constellation Aries. B) in the constellation Taurus. C) in the constellation Gemini. D) in the constellation Cancer. E) in the constellation Leo.
The radius of a typical nucleus is about 5.0 × 10-15 m. Assuming this to be the uncertainty in the position of a proton in the nucleus, estimate the uncertainty in the proton's energy (in eV)
A) 0.2 MeV B) 0.4 MeV C) 0.6 MeV D) 0.8 MeV E) 1.0 MeV
A standard candle is
A) a 7-cm-long wax candle. B) another name for a main-sequence star. C) another name for a barred-spiral galaxy. D) a light source of known luminosity.
What is the energy density in the magnetic field 25 cm from a long straight wire carrying a current of 12 A? (?0 = 4? × 10-7 T ? m/
A) A) 7.3 × 10-5 J/m3 B) 3.7 × 10-5 J/m3 C) 3.6 × 10-4 J/m3 D) 1.2 × 10-4 J/m3 E) The density cannot be determined without knowing the volume.