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All ki that is powerful enough to do anything but push thigs away is visable. That means that the beam you see when Goku fires the kamehameha is the entire attack, there is no eversess energy oozing out. If there was, you would be able to see it. The Ki in beam attacks only harms whatever toutches the beam , untill the beam detonates, and all the energy is released in a big explosion. Beams hardly ever detonate, and to my knowlegde have never detonated when someone didn't want them to, and they can be stoped intirely without any detonation at all. Ki balls are a diffrent matter, but the Kamehameha isn't a ki ball. Also note that the Kamehameha that Goku uses to blow off Cells upper body was a planet buster, the fighters who were watching wondered what the hell Goku was doing because the blast that he was firing could destroy the plannet if it hit it directly, but Goku still fired it, and he didn't hit the earth, instead shooting it upward. He is willing to use planet busters ect.. Also, the Vageta atttack you mentioned wasn't either of the ones I'm pointing out. The one he used on Cell that I pointed out was a planet buster(as stated by Trunks), was when Vageta was at about full power, and happened when Gohan was in the hiperbolic time chaimber.

Beams like the kamehameha can withstand extreem ammounts of pressure like a solar system destroying Kamehameha hitting them or Frezza going directly trough one covered in an enerhy field. Lazzer eyebeams aren't going to set it off prematurely, and if Superman somehow did manage to the explosion would hit him and do major dammage to the planet, if not destroying it. But I thnik the best possible he could do is push the Kamehameha back, which I dout he can do.

I'm sure that Goku can come up with some way to hit Superman with a Kamehameha, he's hit meele fighters with it before. He could always try the old Cell games kamehameha trick, It point blank behind Superman with and already charged and initiated kamehameha and hitting him with it. Also you're assuming that Superman will try to dodge it. He has a bad habbit of trying to block energy beams with his arms or chest.

@Pym-I don't see why people insist on saying that DBZ characters can't do what they are said to be cappable of. I've never seen people say characters can't do what they're so clearly stated to be cappable of except in thecase of DBZ plannet/solar system busters. Now, if I were an author and I were to say once that my character can lift a billion tons, or move five times the speed of light, or that his X attack can destroy a mountain, and people started saying "well, you can't be sure that's true because they've never done so in practice" I would be quite annoyed. If they're capable of something they're capable of it, and if they haven't done so then it's either beause they've never have had reason to or because they don't want to. Now, Toriyama went further than just having someone say Cell could destroy a solar system, which I would think should be enough to make it fact, he went out of his way and waisted time having evry character he could think of reiterate the fact that the attack could in fact destroy a solar system, as if to make sure that no one would dout it. And people still don't belive him. I would also point out that not only would destroying a planet be out of Goku's character, but also that it has never been too his benifit to destroy the any planet. Any point previous to his laerning of the IT destroying the planet he's on would result in his own death. Vs. Androids 19 and 20 it would have been useless because he was way stronger than them anyway. Against Cell it would be useless because Cell can survive in space. Same thing with Buu. I'm not even going to coun't GT since nothing in GT makes sense anyway.

I know that Superman has superspeed, I've seen bolth of the mentioned episodes. But he has nothng on Goku's level. And yes, I know that Gotenks(and, in my opinion, no other DBZ character evcept probably Vegeto) can exced the speed of light, but when is it shown or said that cartoon Suprman can move and furthermore fight at light speed. Also, you must consider the fact that SSJ3 Goku is almost definitly faster than SSJ1Gotenks.

Ok, this hole star wars thing is kinda off topic, but...I am of the opinion that lazzers in the star wars universe are faster than they appear to be, but defintly as fast as real lazzers as some people state them to be. As for the jedi's movements...if they have force speed, they certanly don't like to use it much.

As for DBZ, they specificly say on several okasions that the characters are moving faster than the human eye can see, and are often "seen" moving so fast that they dissapear from sight.

As for Superman, they never say anything about him moving Super fast. Also note the fact that he almost never trys to speed blitz obviously slower enimies, even when it could grant him an easy victory in a fight he has to win.