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| | ==英文题目== | | ==英文题目== |
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| − | '''LIGO (5 points)'''
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| − | The first detection of gravitational waves GW150414 was announced in 2016 by the collaboration LIGO
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| − | (Laser Interferometer Gravitational-Wave Observatory). The detected signal corresponds to the merger
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| − | of two black holes with masses of $$35𝑀_⊙$$ and $$30𝑀_⊙$$, which when joined formed a black hole of $$62𝑀_⊙$$. Ignoring
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| − | the rotational energies of the black holes, you may assume that the energy released by this process
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| − | ($$𝐸_{𝐺𝑊}$$ ) is emitted solely in the form of gravitational waves, that were observed by the interferometer in
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| − | 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
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| − | the energy ratio $$\dfrac{𝐸_{𝑆𝑁}}
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| − | {𝐸_{𝐺𝑊}}$$
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