An airplane propeller pushes against the air, and the air, by Newton’s 3rd law, pushes against the propeller. How does a rocket work in outer space where there is no atmosphere?
A. There is enough atmosphere, even in outer space, for the same principle to work.
B. A rocket exerts a force on its exhaust gases and the gases exert a force on the rocket.
C. Rockets use nuclear power and don’t need an atmosphere to work.
B. A rocket exerts a force on its exhaust gases and the gases exert a force on the rocket.
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Which main sequence stars have the lowest mass?
A) spectral type O B) spectral type M C) spectral type A D) spectral type G E) can't tell from information provided
When we speak of the entire universe (as opposed to the observable universe), we mean
A) all the stars and galaxies that we can see with telescopes. B) all material located within about 14 billion light-years of Earth. C) the sum total of all matter and energy. D) all the matter in galaxies, but not the spaces between the galaxies.
A Young's double-slit experiment is performed in air and then the apparatus is submerged in water. What happens to the fringe separation, and what can be used to explain the change, if any?
a. The separation stays the as it is the same experiment independent of the medium. b. The separation decreases because the frequency of the light decreases in the water. c. The separation increases because the wavelength of the light increases in the water. d. The separation decreases because the wavelength of the light decreases in the water.
If a surface has a work function of 1.5 eV and photons of energy 2.7 eV are shone on the surface, what is a possible kinetic energy of the electrons emitted from the surface?
A) 3.0 eV B) 2.0 eV C) 4.0 eV D) 1.0 eV E) No electrons are emitted.