There was a helicopter standing to one side.
Sorabji looked up at the structure which was about four times his height. He said the good thing about this example is that we get a real sense of the weight of a nucleus the size of a tiny steel ball. The bad thing is that we tend to lose sight of the electrons. Literally. The electrons of this 105,000-kilo nucleus weigh about 1.5 kilos apiece, and to see what that means we’ll have to go to Luton because the first two are in a shell 30 kilometres away.
The helicopter’s propellers began to turn, and the helicopter to rise. Below it dangled a rope ladder. Sorabji leapt onto the ladder and began to climb. We were in the 39 Steps segment of the programme.
Below the helicopter you could see the red structure shrinking first to the size of a football, then a tennis ball, then a golfball, then a tiny dot and then it was gone.
A camera in the helicopter showed mile after mile of houses and Sorabji on the rope ladder. We had seen the programme before but Sib said she wanted to see it again.
The helicopter came down 30 kilometres away at a field near Luton. Sorabji stepped onto the ground. He said: One of the things that makes electrons so hard to think about is that they don’t have size in the normal sense of the word, and another is the fact that you can never know exactly where an electron is at any given time. This makes an electron highly unlike this 1.5-kilo free weight from a local gym. But a 110-Astra nucleus at Wembley weighs about 72,000 times as much as this 1.5-kilo electron at Luton, and in that it’s highly like the relation of the nucleus of a potassium atom to an electron. He showed on a map that the second shell would be at Birmingham and the third shell would be at Sheffield and the fourth at Newcastle and he said that instead of going on to Birmingham he was going to introduce Mr. James Davis of Dunstable Tae Kwon Do. Mr. Davis was a black belt, fourth dan; he was going to break a brick with his bare hand.
The brick was on a stand. Davis stood in front of it. He raised his arm; he brought down his arm; the brick broke into two pieces and fell to the floor.
Sorabji asked how long he had had to train to learn to do it and Davis said he had been studying martial arts all his life but he would say he had started to take it seriously about ten years ago.
He said: I don’t want any youngsters out there watching to get the wrong idea, obviously there is an element of hardening the body involved but I’d say the essential thing is it’s about training the mind. There are a lot of misconceptions about the sport, people think it’s all blokes acting out some Bruce Lee fantasy and I won’t deny there are some dojangs naming no names where that’s about all there is to it.
He said: Well, you’ve got your programme to get on with but there’s just one point I’d like to make, which is that the more you study any martial art the less likely you are to actually get in a fight and the less likely you are to put yourself in the type of situation where you have to fight. A beginner might do that type of thing but the more you progress the more you realise the skill is something not to be used lightly.
He said: Also the more you progress the more you realise that there is more to it than trying to progress. As a beginner you just want to improve as fast as you can, you tend to obsess about getting to the next colour of belt, there comes a time, or there should come a time, when you rise above that. Obviously you improve your skill by fighting someone as good as you are or better, well, if you think about it, if the only point is to improve your skill there’s nothing in it for the better fighter. There was a time when for that very reason the last thing I wanted was to open a school. But there comes a time when you realise you have to help young people coming along, and in the final analysis that was why I agreed to come on this show. If you, as a Nobel Prize winner, can take time away from the lab to help train young minds who am I to say no.
Sorabji said: Thank you for joining us.
He said: Let’s see this one more time in slow motion, and they replayed the arm rising and falling and the brick splitting in two.
Sib said: Do they teach you all that in judo?
I said we didn’t learn to break bricks because judo was mainly about throws and falls.
Sib said: Oh well.
He said: If the space between a nucleus and the first electron shell is like the space between 110 Vauxhall Astras at Wembley and a 1.5-kilo weight at Luton, and if the space between the first shell and the second is like the distance between Luton and Birmingham, why does it take ten years of serious mental and physical training to get a hand through a brick? At the atomic level both hand and brick are almost entirely empty space. The fact is it is not the matter in the hand which repels the matter in the brick. The repulsion is the result of electrical charge. If it were not for electrical charge we could walk through walls.
The first time I saw the programme I was very impressed by this. Now I suddenly thought Wait a minute.
I said to Sib that I did not think you could have an atom without electrical charge and if you couldn’t have an atom how could you have walls and I said maybe I should write him a letter and sign it Ludo aged 11.
Sib said: If you think he is unaware of the fact you should certainly bring it to his attention. She said you should only sign a letter aged 11 if you were saying something cleverer than the average 11-year-old would say and it was not a good idea if you had completely missed the point.
She said he was obviously trying to communicate a fact to the public at large.
I said: Fine.
She said: I wonder if it’s too late to move to Dunstable.
I said: What?
Sorabji explained that the electrons orbited the nucleus billions of times in a millionth of a second, the effect was similar to that of the propellers of a helicopter and it was the speed of the electrons that made the atom solid.
Sibylla commented that Sorabji was largely self-taught.
Sorabji’s father was a Parsi from Bombay; his mother was English. She first met his father on a visit to Cambridge: her brother was reading mathematics at Trinity College and introduced her to another man on the same staircase. At first they did not hit it off, because she made a comment about India and he had the bad manners to say that as she had never set foot in the country he would be interested to know on what she based her opinion; she said later he was the rudest man she had ever met. He went back to India and she was presented and did the usual things and it was all rather a bore. She had always been unconventional and she got the idea of going out to India just to see the place. At first her father refused his permission, but she turned down three or four offers of marriage and began taking a horse out and setting it at six-foot fences, and when she had broken an arm and a collarbone her father said he supposed he’d better let her go then, before one of the horses got hurt.
She sailed to Bombay and it was not at all what she had expected. The Club defied description. So did the people. Also, it was rather hot. That is, she had expected it to be hot, but she had expected it to be cooler. But she looked up the rudest man she had ever met and this time they got on like a house on fire. She said that now that she had set foot in the country she could say whatever she liked and he said he was delighted to hear that she had overcome the diffidence which had afflicted her on a previous occasion. She said something rather cutting and he said something quite rude. She knew he was brilliant because her brother had said he was one of the most brilliant mathematicians he knew, but though he was brilliant and rude he was not condescending. Her brother’s other friends were unfailingly charming, so that she could not talk to one without instantly afterwards taking out a horse and setting it at a six-foot fence. She had never met a man who could open his mouth without imperilling the life of a horse.