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.
b
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If a battleship sinks in a canal lock, the water level in the lock will
A) rise. B) fall. C) remain unchanged.
A diffraction grating has 6.00 × 103 lines per centimeter ruled on it
What is the angular separation between the second and the third orders on the same side of the central order when the grating is illuminated with a beam of light of wavelength 550 nm? A) 20.5° B) 30.5° C) 40.6° D) 50.5°
Quarks are made up of subatomic particles, such as protons and electrons
Indicate whether the statement is true or false
The triple alpha process requires higher temperatures to start and produces less energy for a given mass than the proton-proton chain.
Answer the following statement true (T) or false (F)