UNIVERSE
ASTEROIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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is gas and dust pulled off the comet by the Sun’s gravity
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always points away from the Sun
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trails behind the comet, pointing away from the Sun as the comet approaches it, and toward the Sun as the comet moves out of the inner Solar System.
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lis gas and dust expelled from the comet’s nucleus and blown outward by radiation pressure and the solar wind.
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both b and d
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Detailed explanation-1: -When comets come near the Sun, their tails become visible because heat from the Sun vaporizes some of the icy nucleus or head and sunlight reflects from the vapor. Solar wind pushes the vapor in a direction away from the Sun to form the comet’s tail. For this reason, comet tails generally point away from the Sun.
Detailed explanation-2: -The tail of the comet is gas and dust boiled off by the heat if the sun. So no new tail material is emitted once it gets away from the sun. So, if the Earth passes through the comet’s orbit we can expect an increase in meteors from the dust component. Q.
Detailed explanation-3: -Tail of comets appears as a Tyndall cone because of the scattering of light by the tiny solid particles that are left behind by the comet in its route. We can define the Tyndall effect as the phenomenon of scattering of particles of light in its path.