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範例:質能互換與太陽輻射[102指考]

太陽能為極重要的綠色能源,在太陽進行核融合的過程中,當質量減損△m時太陽輻射的能量△E=△mc2c為光速)。地球繞太陽公轉的軌道平均半徑約為1.5×1011 m,鄰近地球表面正對太陽處測得太陽能的強度約為1.4×103W/m2,已知光速為3.0×108 m/s,則太陽因輻射而減損的質量,每秒鐘約為多少公斤?(球的表面積為4πr2,其中r為球的半徑)(A)1.5×10-2 (B) 1.5×103 (C) 3.3×105 (D) 1.1×107 (E) 4.4×109

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