The shorter a wave's wavelength, the greater its energy
Indicate whether the statement is true or false
TRUE
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The total mass of the pair of stars in spectroscopic binaries are difficult to estimate because
a. we can't measure the radial velocities of each star in the system. b. we can't see the shape or tilt of the orbit. c. we can't find the diameters of the stars. d. we can't determine the luminosities of the stars. e. the Doppler shift is not measurable.
Imagine that we constrain a rectangular loop to move through a square region where the magnetic field 
is uniform and downward (in the -z direction), as shown below. Assume that 
outside that region. We can divide the loop’s motion up into five phases: For each of the five phases, which of the following is true? The loop has not yet entered the magnetic field.
A. Current flows clockwise in the loop.
B. Current flows counterclockwise in the loop.
C. Current does not flow in the loop.
What is the shortest-wavelength X-ray photon emitted in an X-ray tube subject to 50 kV?
A) 0.025 nm B) 0.25 nm C) 2.5 nm D) 25 nm E) none of the given answers
Neutron activation is used
A. to treat cancer B. to search for rare atoms C. to provide energy D. to create light