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.
d
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The wavelengths associated with thermal radiation at everyday temperatures are in the ________ spectral region.
A. infrared B. ultraviolet C. shorter visual D. longer visual E. x-ray
You are in the northern hemisphere and the season is winter. The Sun is above a geographic point in the southern hemisphere and below the celestial equator
a. True b. False Indicate whether the statement is true or false
Without glasses, a person can comfortably read a magazine when it is held at 60 cm from his eyes. What should be the focal length of his contact lenses to allow him to read the magazine comfortably at a distance of 30 cm?
A) -30 cm B) +30 cm C) -60 cm D) +60 cm E) +90 cm
The lifetime of a ?+ meson normally is 18 nanoseconds. In a large particle accelerator, scientists can create p+ mesons moving at speeds very close to the speed of light
What do the scientists observe when they measure the lifetime of a ?+ meson that is created at very high speed? A) The ?+ meson lasts 18 nanoseconds. B) The ?+ meson lasts much less than 18 nanoseconds. C) The ?+ meson lasts much more than 18 nanoseconds. D) The ?+ meson no longer decays, and remains as a stable particle.