If you want to know how much damage each bomb makes here you can check out the numbers https://azurlane.koumakan.jp/List_of_Dive_Bombers
What happened to this rule?
Dive bombers share the same problem with fighters. Let's reiterate it.
First rule of fighters and dive bombers:
BASE DAMAGE STAT IS COMPLETELY USELESS
BASE DAMAGE STAT IS COMPLETELY USELESS
BASE DAMAGE STAT IS COMPLETELY USELESS
The rationale is as follows:
For one-dimensional equipments (guns and torpedoes), the damage comes from the equipment as a single entity. Therefore the numbers listed in game are accurate.
Planes are not one-dimensional like those. Each plane comes with its own set of weapons(machine guns, bombs, torpedoes etc) that each have stats of their own.
The number the game calculates is the theoretical damage based on all weapons assuming they all hit. This is drastically inaccurate because weapons have their own sets of attributes that need to be considered.
An (non-perfect)analogy would be like this: In this game, you can tell what a ship is good at, because you can see if she has high firepower, high torp or high AA etc. But imagine that instead of displaying each stat for your ship separately, they combined all of them and put an average number next to the ship's name. This is very unhelpful and is exactly what the game is doing to fighters and dive bombers. DPS calculated completely out of context based on the displayed damage stat is completely worthless and should not be referenced at all.