Concept explainers
(a)
The time for which the sun must shine in order to release energy produced by the mass-energy conversion of a carbon
(a)

Answer to Problem 9Q
Solution:
4.6×10−36 s
Explanation of Solution
Given data:
The sun’s luminosity is 3.90×1026 W, and the mass of carbon atom is 2×10−26 kg.
Formula used:
Time taken in seconds is given as:
t=EL⊙
Here, E is the energy released due to mass-energy equivalence in joule and L⊙ is the luminosity in joule per second.
Einstein’s mass-energy conversion:
E=mc2
Where, E is the energy release from the mass of m and c is speed of light.
Explanation:
Calculating the energy released mass-energy conversion of a carbon atom:
E=mc2
Replace 2×10−26 kg for m and 3×108 m/s2 for c in the above equation:
E=(2×10−26 kg)(3×108 m/s22)=1.8×10−9 J
Recalling the expression for time:
t=EL⊙
Substituting 1.8×10−9 J for E and 3.90×1026 W for L⊙ in the above expression:
t=1.8×10−9 J3.90×1026 Jsecond =4.6×10−36 seconds
Conclusion:
The sun must shine 4.6×10−36 s to produce the energy produced by a carbon atom with mass 2×10−26 kg.
(b)
The time for which the sun must shine in order to release energy produced by the mass-energy conversion of 1 kg substance. The sun’s luminosity is 3.90×1026 W.
(b)

Answer to Problem 9Q
Solution:
2.3×10−10 s
Explanation of Solution
Given data:
The sun’s luminosity is 3.90×1026 W, and the mass of the substance is 1 kg.
Formula used:
Time taken in seconds is given as:
t=EL⊙
Here, E is the energy released due to mass-energy equivalence in joule and L⊙ is the luminosity in joule per second.
Einstein’s mass-energy conversion:
E=mc2
Where, E is the energy release from the mass of m and c is
Explanation:
Calculating the energy released mass-energy conversion of a carbon atom:
E=mc2
Replace 1 kg for m and 3×108 m/s2 for c in the above equation:
E=(1 kg)(3×108 m/s22)=9×1016 J
Recalling the expression for the time:
t=EL⊙
Substituting 9.1×1016 J for E and 3.90×1026 W for L⊙ in the above expression:
t=9.1×1016 J 3.90×1026 Jsecond =2.3×10−10 seconds
Conclusion:
The sun must shine for 2.3×10−10 seconds to produce the energy produced by a substance with mass 1 kg.
(c)
The time for which the sun must shine in order to release energy, produced by the mass-energy conversion of Earth with mass 6×1024 kg. The sun’s luminosity is 3.90×1026 W.
(c)

Answer to Problem 9Q
Solution:
1.4×1015 seconds
Explanation of Solution
Given data:
The sun’s luminosity is 3.90×1026 W, and the mass of Earth is 6×1024 kg.
Formula used:
Time taken in seconds is given as:
t=EL⊙
Here, E is the energy released due to mass-energy equivalence in joule and L⊙ is the luminosity in joule per second.
Einstein’s mass-energy conversion:
E=mc2
Where, E is the energy release from the mass of m and c is speed of light.
Explanation:
Calculating the energy released mass-energy conversion of a carbon atom:
E=mc2
Replace 6×1024 kg for m and 3×108 m/s2 for c in the above equation:
E=(6×1024 kg)(3×108 m/s22)=5.4×1041 J
Recalling the expression for time:
t=EL⊙
Substituting 5.4×1041 J for E and 3.90×1026 W for L⊙ in the above expression:
t=5.4×1041 J3.90×1026 Jsecond =1.4×1015 seconds
Conclusion:
The sun must shine for 1.4×1015 seconds to produce the energy produced by a substance with mass 6×1024 kg.
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Chapter 16 Solutions
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