A surface has a work function 1.70 eV and has light of wavelength 400 nm shone on it. What is the maximum speed of the photoelectrons emitted?
A)
1.0 × 106 m/s
B)
1.3 × 106 m/s
C)
7.0 × 105 m/s
D)
7.7 × 105 m/s
E)
3.5 × 106 m/s
C
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The corona and chromosphere of the Sun are believed to be heated by
a. shock waves rising from below the photosphere. b. the solar wind. c. sunspots. d. magnetic carpets. e. differential rotation.
If the size of our solar system were scaled down to a radius of 1 kilometer, approximately how far away would the nearest stars be on this scale?
A) several hundred kilometers B) several million kilometers C) several thousand kilometers D) several billion kilometers
Is there any actual evidence that our solar system originate from a collapsing cloud of gas, as described in the textbook?
A) Evidence comes from observations of Earth's oldest rocks. B) Evidence comes from observations of gas clouds around new stars elsewhere in our galaxy. C) Evidence comes from observations of the moon, meteorites, other planets, and other moons. D) All of the above. E) No, this description is based only on the theory of gravity and other theories.
A ray of light is incident on a liquid-to-glass interface at an angle of 42°. Indices of refraction for the liquid and glass are, respectively, 1.63 and 1.52 . What is the angle of refraction for the ray moving through the glass?
a. 23° c. 46° b. 30° d. 38°