X rays are used in radar
Indicate whether the statement is true or false
F
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A diatomic molecule is vibrating in its first excited quantum state above the ground state. In that excited state, its frequency is 2.0 × 1013 Hz
What is the energy of the molecule in this state? (h = 6.626 × 10-34 J ? s, h = 1.055 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J A) 0.12 eV B) 0.15 eV C) 0.041 eV D) 0.17 eV E) 0.083 eV
Jane and Jake are looking at what happens to body 1 of mass m and body 2 of mass 2m, initially at rest, when equal forces are applied separately to the two bodies. Jake says that equal forces applied for equal times do equal amounts of work on the two bodies. Jane says that the two forces do equal amounts of work only if the two bodies move equal distances in the direction of the forces. Which
one, if either, is correct? a. Jake, because the speed of body 1 is half the speed of body 2, but m1v1 = m2v2. b. Jane, because work does not depend on mass, only on force times distance. c. Jake, because all bodies travel equal distances when equal forces are applied for equal times. d. Jane, because it takes the same time for all bodies to travel equal distances when equal forces are involved. e. Neither, because we can't compare the amounts of work done on bodies of different mass.
Which of the following statements is TRUE?
A. The blackbody spectrum peaks at a longer wavelength for a red supergiant than for a blue main sequence star. B. Helium absorption lines only appear in the coolest main sequence stars. C. The blackbody spectrum peaks at a shorter wavelength for a red supergiant than for a blue main sequence star. D. The blackbody spectrum peaks at a longer wavelength for a red supergiant than for a red main sequence star of the same spectral class. E. The blackbody spectrum peaks at a shorter wavelength for a red supergiant than for a red main sequence star of the same spectral class.
Which of the following observations is consistent with the hypothesis that all life on Earth has a common ancestor?
A) different organisms use the same set of amino acids B) different organisms use different sets of amino acids C) all proteins are made of amino acids D) some organisms don't use amino acids at all