When Black Holes collide, they release:

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Consider the phenomenon described: the collision (merger) of black holes. 
Option 1: 'Dust clouds' — In isolated black hole mergers, there isn’t a surrounding dust cloud that is fundamentally emitted by the merger itself; such a scenario would require matter around the black holes, which is not the defining emission of the merger. Therefore this option mischaracterizes the primary signal. 
Option 2: 'Gravitational waves' — The merger of black holes is a dramatic source of gravitational waves, ripples in spacetime predicted by general relativity and observed by detectors like LIGO/Virgo. This is the canonical emission associated with two black holes merging. 
Option 3: 'Ultraviolet waves' — Gravitational mergers do not inherently emit ultraviolet radiation as a fundamental signature; any high-energy EM radiation would depend on additional matter present (like accretion disks), which is not guaranteed by the merger itself. Thus this is not the defining emission. 
Option 4: 'Visible light waves' — Similar to ultraviolet, visible light would require interacting matter and isn’t the intrinsic signal produced by the black holes’ merger; it is not the primary, characteristic emission used to detect such events. 
In summary, the standout signal that uniquely identifies a black hole merger is the emission of gravitational waves, whereas the other options either assume matter involvement or misstate the primary radiative output.

My LMS Subjects Quiz Topic 1: The Big Bang

When Black Holes collide, they release:

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