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.
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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
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
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