A light ray whose frequency is 6.00 × 10^14 Hz in vacuum is incident on water (n = 1.33). The wavelength of the light after it enters the water is (in nm)
a. 798
b. 500
c. 665
d. 376
e. 266
d
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Photoelectric Effect: A beam of light with a frequency range from 3.01 × 1014 Hz to 6.10 × 1014 Hz is incident on a metal surface. If the work function of the metal surface is 2.20 eV, what is the maximum kinetic energy of photoelectrons ejected from this surface? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 0.33 eV B. 0.21 eV C. 0.42 eV D. 0.16 eV E. 0.48 eV
Which statement about Pluto is not true?
A) Its surface temperature is very cold. B) It is made mostly of rock and ice. C) It is both smaller and less massive than Earth. D) It is the most massive object in the Kuiper belt. E) It was visited by the New Horizons spacecraft in 2015.
There is a legend of a Dutch boy who bravely held back the Atlantic Ocean by plugging a leak near the top of a dike with his finger until help arrived. Which is the more likely scenario?
A) the huge size of the Atlantic Ocean makes this impossible B) although the force on his finger would have been huge, the pressure would have been small enough for this to occur C) the force on his finger would have been less than 1 N D) both force and pressure on his finger would have been great, but not too great for a public-spirited Dutch lad E) none of the above
Four resistors having resistances of 20 ?, 40 ?, 60 ?, and 80 ? are connected in series across an ideal dc voltage source. If the current through this circuit is 0.50 A, what is the voltage of the voltage source?
A) 20 V B) 40 V C) 60 V D) 80 V E) 100 V