On a bright and sunny day, the intensity of solar radiation on the Earth's surface is 1 000 W/m2 . If the average wavelength of the sunlight is 500 nm, how many photons are incident on a square meter of the Earth's surface per second?
[Ques. 2] The planet ______________ has retrograde motion.
Fill in the blank(s) with correct word
[Ques. 3] A particular material has an index of refraction of 2.75 . What percent of the speed of light in vacuum is the speed of light in the material?
a. 36
b. 10
c. 8
d. 89
[Ques. 4] What is the energy in eV of a photon of yellow light? = 500 nm.
[Ques. 5] The most distant planet that can be seen with the unaided eye is ______________.
Fill in the blank(s) with correct word
[Ques. 6] The speed of light in a material is 1.74 108 m/s. What is the index of refraction of this material?
a. 1.72
b. 0.58
c. 1.74
d. 0.218
[Ques. 7] If a rubidium surface is irradiated with blue light of wavelength 450.0 nm, what is the kinetic energy of the electrons emitted? (The work function for rubidium is = 2.09 eV.)
[Ques. 8] The rings of Saturn were discovered by ______________.
Fill in the blank(s) with correct word
[Ques. 9] The ratio of the speed of light in a vacuum to the speed of light in a medium is known as the index of
a. reflection.
b. refraction.
c. diffraction.
d. none of these.
[Ques. 10] Because of Heisenberg's Uncertainty Principle, the velocity of a particle is known least precisely when the length of the wave packet representing the particle is
a. < 1015 m.
b. < 1010 m.
c. of the order of 1.00 m.
d. >10 m.
e. the length of a plane wave (infinite)
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