When the energy state of an atom changes by ?E, the frequency of the photon emitted or absorbed is calculated by dividing ?E by ______________
Fill in the blank(s) with correct word
h, or Planck's constant
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A 3.10-eV electron is incident on a 0.40-nm barrier that is 5.67 eV high
What is the probability that this electron will tunnel through the barrier? (1 eV = 1.60 × 10-19 J, mel = 9.11 × 10-31 kg, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 1.4 × 10-3 B) 9.0 × 10-4 C) 1.0 × 10-3 D) 1.5 × 10-3 E) 1.2 × 10-3
Mars has _______________ but it is hidden
Fill in the blank(s) with correct word
Which of the following observations would tell us that there are intergalactic clouds of cool gas between a distant quasar and us?
A) We see hydrogen emission lines at redshifts smaller than that of the quasar. B) We see hydrogen absorption lines at redshifts smaller than that of the quasar. C) We see hydrogen emission lines at redshifts greater than that of the quasar. D) We see hydrogen absorption lines at redshifts greater than that of the quasar. E) We see that the emission lines from the quasar are lessened by intervening gas and dust.
For a projectile launched horizontally, the vertical component of a projectile's velocity
A) is zero. B) remains a non-zero constant. C) continuously increases. D) continuously decreases. E) any of the above, depending on position.