题目内容
物理学家们普遍相信太阳发光是由于其内部不断发生从氢核到氦核的核聚变反应.根据这一理论,在太阳内部4个氢核(
)转化成一个氦核(
)和两个正电子(
)并放出能量.已知质子质量mP=1.0073u,α粒子的质量mα=4.0015u,电子的质量me=0.0005u. 1u的质量对应931.5MeV的能量。
(1)写出该热核反应方程
(2)一次这样的热核反应过程中释放出多少兆电子伏的能量?(结果保留四位有效数字)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115021469235.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115021485266.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115021500227.gif)
(1)写出该热核反应方程
(2)一次这样的热核反应过程中释放出多少兆电子伏的能量?(结果保留四位有效数字)
(1)4
→
+2
(2)Δ
=24.87 MeV
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115021516232.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115021485266.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115021500227.gif)
(2)Δ
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115021563204.gif)
(1)4
→
+2
(2)Δm=4mP-mα-2me
=4×1.0073u-4.0015u-2×0.0005u
="0.0267" u
Δ
=0.0267 u×931.5MeV/u
Δ
=24.87 MeV
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115021516232.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115021485266.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115021500227.gif)
(2)Δm=4mP-mα-2me
=4×1.0073u-4.0015u-2×0.0005u
="0.0267" u
Δ
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115021563204.gif)
Δ
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115021563204.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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