The photoelectric effect in a cosmic context. Ultraviolet radiation striking dust grains composed of the moon’s dominant rock type, feldspar (with work function 4.5 eV), leaves them with a small electric charge. Smaller grains levitate due to the resulting electrostatic repulsion, giving the surface a diffuse dust halo. What sign of charge do the dust grains have?A. NegativeB. PositiveC. Some grains are negative, some are positive.
The photoelectric effect in a cosmic context. Ultraviolet radiation striking dust grains composed of the moon’s dominant rock type, feldspar (with work function 4.5 eV), leaves them with a small electric charge. Smaller grains levitate due to the resulting electrostatic repulsion, giving the surface a diffuse dust halo. What sign of charge do the dust grains have?A. NegativeB. PositiveC. Some grains are negative, some are positive.
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What sign of charge do the dust grains have?
A. Negative
B. Positive
C. Some grains are negative, some are positive.
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