Question

what frequentcy of sound is produced when 2 black holes collapse with eack other​

Answer 1

Answer:

We can't measure 'frequentcy' because it's vacuum out there.

Explanation:

So if you want more explanation on how they measure gravitational wave frequency try watching some YouTube videos.

Answer 2

Answer:

Gravitational waves sent out from a pair of colliding black holes have been converted to sound waves, as heard in this animation. On September 14, 2015, LIGO observed gravitational waves from the merger of two black holes, each about 30 times the mass of our sun.