A.原子核物理学
B.核化学、核电子学
C.辐射剂量学、核辐射探测技术
D.放射生物学、放射卫生学、放射生态学
E.辐射评价学
The nuclear energy is released at the Sun's center as high-energy gamma radiation, a form. of electro magnetic radiation like light as radio waves, only of every much shorter wavelength. This gamma radiation is absorbed by atoms inside the Sun, to be reemitted at slightly longer wavelengths. This radiation, in its turn, is absorbed and reemitted. As the energy filters through the layers of the solar interior, it passes through the x-ray part of the spectrum, eventually becoming light. At this stage, it has reached what we call the solar surface, and can escape into space, without being absorbed further by solar atoms. A very small fraction of the Sun's light and heat is emitted in such directions that, after passing unhindered through interplanetary space, it hits the Earth.
What does the passage mainly discuss?
A.The production of solar light and heat.
B.The physical and chemical nature of life.
C.The conversion of hydrogen to helium.
D.Radiation in the x-ray part of the spectrum.
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