In an experiment different wavelengths of light, all able to eject photoelectrons, shine on a freshly prepared (oxide-free) zinc surface. Which statement is true?
a. The number of photoelectrons emitted per second is independent of the intensity of the light for all the different wavelengths.
b. The number of photoelectrons emitted per second is directly proportional to the frequency for all the different wavelengths.
c. The maximum kinetic energy of the photoelectrons emitted is directly proportional to the frequency for each wavelength present.
d. The maximum kinetic energy of the photoelectrons has a linear relationship with the frequency for each wavelength present.
e. The maximum kinetic energy of the photoelectrons is proportional to the intensity of the light and independent of the frequency.
D
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Applications to Astronomy: Four different main-sequence stars are colored blue, orange, red, and yellow. What is their rank from coolest to hottest?
A. blue, yellow, orange, red B. orange, blue, yellow, red C. red, orange, yellow, blue D. red, yellow, orange, blue
How much of the Earth's surface is experiencing night at any time?
a. less than one-half, because of the tilt of the equator to the ecliptic plane b. more than one-half, because of the precession of the poles c. exactly one-half d. all of the night sky
The choices below describe four hypothetical planets. Which one's surface would you expect to be most crowded with impact craters? (Assume the planets orbit a star just like the Sun and that they are all the same age as the planets in our solar
system.) A) Size: same as Venus. Distance from Sun: same as Mars. Rotation rate: once every 25 hours. B) Size: same as Mars. Distance from Sun: same as Earth. Rotation rate: once every 18 hours. C) Size: same as the Moon. Distance from Sun: same as Mars. Rotation rate: once every 10 days. D) Size: twice as big as Earth. Distance from Sun: same as Mercury. Rotation rate: once every 6 months.
Monochromatic light is incident on a diffraction grating that is 75 mm wide and ruled with 50,000 lines. The second-order maximum is seen at 32.5°. What is the wavelength of the incident light?
A) 202 nm B) 403 nm C) 605 nm D) 806 nm