The wave-particle duality applies to
A) photons.
B) electrons.
C) protons
D) all of the above
E) none of the above
Answer: D
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The magnetic field at a distance of 2 cm from a current carrying wire is 4 ?T. What is the magnetic field at a distance of 1 cm from the wire?
A) 2 ?T B) 4 ?T C) 6 ?T D) 8 ?T E) 10 ?T
If the plane of the Moon's orbit around the Earth was perfectly aligned with the ecliptic plane (instead of being tilted by about 5°), a solar eclipse would be visible on some parts of Earth
A) once a day. B) never. C) about once a month. D) about once every six months. E) about once a year.
A violet-hot star emits radiation having about twice the peak frequency of radiation from a red-hot star. The surface temperature of the hotter star is about
A) half that of the cooler star. B) twice that of the cooler star. C) the same.
A mercury manometer measures a pressure of 200 mmHg. What is this pressure in atm?
A. 0.204 B. 0.263 C. 0.301 D. 0.325 E. 0.375