The Polynesian navigators of the South Pacific found their way primarily by observing the position of Polaris in the night sky
Indicate whether the statement is true or false
FALSE
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An astronomical unit is larger than a light-year
a. True b. False Indicate whether the statement is true or false
In the Bohr model of the atom, an electron can only exist in specific, well-defined energy levels
Indicate whether the statement is true or false
A string fixed at both ends is vibrating in one of its harmonics. If we now increase only the frequency at which the string is vibrating, which of the following characteristics do we also increase? (There could be more than one correct choice.)
A) the speed of the traveling waves on the string B) the period of the traveling waves on the string C) the wavelength of the traveling waves on the string D) the amplitude of the traveling waves on the string E) none of the above
The average distance of the electron from the proton in the hydrogen atom is 0.51 × 10^-10 m. What is the electric field from the proton's charge at the location of the electron? (ke = 8.99 × 10^9 N×m2/C2, e = 1.6 × 10^-19 C)
a. 8.8 × 10^-8 N/C c. 3.2 × 10^2 N/C b. 1.0 × 10^6 N/C d. 5.5 × 10^11 N/C