Consider a spacecraft that travels round-trip to the zeta reticuli star system (distance 39.5 light-years) at 99% of the speed of light
If the round-trip travel time as measured from Earth is 79.8 years, how much time would pass for passengers on the spacecraft?
A) 39.9 years
B) 79.8 years
C) 22.6 years
D) 11.3 years
D
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For an unpolarized EM wave, the electric field direction is
A. perpendicular to the magnetic field direction. B. parallel to the magnetic field direction. C. perpendicular to the direction of wave propagation, but randomly oriented with respect to the magnetic field direction. D. parallel to the direction of wave propagation.
Energy Levels: The figure shows part of the energy level diagram of a certain atom. The energy spacing between levels 1 and 2 is twice that between 2 and 3. If an electron makes a transition from level 3 to level 2, the radiation of wavelength ? is emitted. What possible radiation wavelengths might be produced by other transitions between the three energy levels?
A. both ?/2 and ?/3 B. only ?/2 C. both 2? and 3? D. only 2?
The speed of a sound wave in air depends on
A) its frequency. B) its wavelength. C) air temperature. D) all of the above E) none of the above
The luminosity class is assigned to a star by studying the absorption lines in the spectrum of the star
a. True b. False Indicate whether the statement is true or false