<caption><image_43>The image is a black and white still from a television show. It shows a man in a suit sitting at a desk with a microphone in front of him. He is looking directly at the camera with a serious expression on his face. On the desk, there is a small white square with a black line drawn on it. The background is a plain wall. The overall mood of the image is serious and professional.</caption><caption><image_44>The image is a black and white photograph of a person's hand holding a pen and writing on a clipboard. The clipboard is placed on a table and the person is holding the pen in their right hand. On the clipboard, there is a piece of paper with a handwritten message written on it. The message reads "10" and there are two curved lines drawn on the paper. The background is dark and the image appears to be taken in a dimly lit room.</caption><caption><image_45>The image is a black and white still from a television interview. It shows a man in a suit and tie, standing in front of a plain background. He appears to be in his late twenties or early thirties, with short, dark hair and a serious expression on his face. He is wearing a dark suit with a white shirt and a black tie. The man is looking directly at the camera with a slight smile on his lips. The overall mood of the image is serious and professional.</caption> another minimum and here's our central maximum we're going on tap the pointer is in the middle here's the first minimum and again the second maximum is hardly distinguishable we have an interference pattern we could have plotted it just by listening to the sound now let me bring it back to the central maximum and look at those pulses listen to them they are caused by photons we saw that in the last film when we found no delay between the emission of electrons and the turning on of the light photons particles are forming an interference pattern a characteristic wave phenomena so look at this you remember that the output of the photomultiplier was about 10 to the minus 9 amp ere's and that it had an amplification of about a million so that the current coming in here must have been about 10 to the minus 15 and that's 10,000 electrons per second not every photon that strikes the photomultiplier produces an electron some get lost on the average only one out of every thousand photons succeeds in producing an electron that is 10 to the 3 photons
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