“2021年IOAA理论第11题-抛射体的最小速度”的版本间的差异
Jingsong Guo（讨论 | 贡献） |
Jingsong Guo（讨论 | 贡献） |
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'''LIGO (5 points)''' | '''LIGO (5 points)''' | ||
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The first detection of gravitational waves GW150414 was announced in 2016 by the collaboration LIGO | The first detection of gravitational waves GW150414 was announced in 2016 by the collaboration LIGO | ||
(Laser Interferometer Gravitational-Wave Observatory). The detected signal corresponds to the merger | (Laser Interferometer Gravitational-Wave Observatory). The detected signal corresponds to the merger | ||
of two black holes with masses of $$35𝑀_⊙$$ and $$30𝑀_⊙$$, which when joined formed a black hole of $$62𝑀_⊙$$. Ignoring | of two black holes with masses of $$35𝑀_⊙$$ and $$30𝑀_⊙$$, which when joined formed a black hole of $$62𝑀_⊙$$. Ignoring | ||
the rotational energies of the black holes, you may assume that the energy released by this process | the rotational energies of the black holes, you may assume that the energy released by this process | ||
| − | ( | + | ($$𝐸_{𝐺𝑊}$$ ) is emitted solely in the form of gravitational waves, that were observed by the interferometer in |
2015. You are given that the explosion of a supernova (SN) releases $$𝐸_{𝑆𝑁} = 2 × 10^{44} 𝐽$$ . | 2015. You are given that the explosion of a supernova (SN) releases $$𝐸_{𝑆𝑁} = 2 × 10^{44} 𝐽$$ . | ||
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To find out which of these two events (SN, GW) releases more energy, estimate | To find out which of these two events (SN, GW) releases more energy, estimate | ||
2022年3月9日 (三) 21:47的版本
英文题目
LIGO (5 points)
The first detection of gravitational waves GW150414 was announced in 2016 by the collaboration LIGO (Laser Interferometer Gravitational-Wave Observatory). The detected signal corresponds to the merger of two black holes with masses of $$35𝑀_⊙$$ and $$30𝑀_⊙$$, which when joined formed a black hole of $$62𝑀_⊙$$. Ignoring the rotational energies of the black holes, you may assume that the energy released by this process ($$𝐸_{𝐺𝑊}$$ ) is emitted solely in the form of gravitational waves, that were observed by the interferometer in 2015. You are given that the explosion of a supernova (SN) releases $$𝐸_{𝑆𝑁} = 2 × 10^{44} 𝐽$$ .
To find out which of these two events (SN, GW) releases more energy, estimate the energy ratio $$\dfrac{𝐸_{𝑆𝑁}} {𝐸_{𝐺𝑊}}$$ .
