You observe a star and you want to plot it on an H-R diagram. You will need to measure all of the following, except the star's
A) mass.
B) distance.
C) apparent brightness.
D) spectral type.
A) mass.
You might also like to view...
Neptune has a radius of 2.48 × 107 m and an escape velocity of 23,300 m/s. What is the mass of Neptune? G = 6.67 x 10-11 N•m2/kg2
A) 1.01 × 1026 kg B) 2.02 × 1026 kg C) 3.03 × 1026 kg D) 4.04 × 1026 kg E) 5.05 × 1026 kg
Matter Waves: The spacing of the atoms of a crystal is 159 pm. A monoenergetic beam of neutrons directed normally at the surface of the crystal undergoes first order diffraction at an angle of 58° from the normal. What is the energy of each of the neutrons? (mneutron = 1.675 × 10-27 kg, 1 eV = 1.6 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 0.045 eV B. 0.039 eV C. 0.050 eV D. 0.056 eV E. 0.061 eV
The electron microscope is based on the use of
A) X-rays. B) high-frequency sound waves. C) matter waves. D) electromagnetic waves. E) mesons.
True or False: A photon is reflected from a mirror. Because a photon has zero mass, it does not exert a force on the mirror
1.True 2.False