Прочитайте текст и выберите утверждение соответствующее содержанию текста Zworykin’s most critical i...: ответ на тест 781533 - Английский язык

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Zworykin’s most critical invention was the first iconoscope camera tube, which he patented in 1923. The key to its success was the fact that its silvered-mica photocathodes stored the charges induced by the image that was focussed on them until the scanning electron beam simultaneously neutralized the charges and modulated itself.
A year after he invented the iconoscope, Zworykin invented the kinescope - a TV picture tube - thus becoming responsible for both the key transmitting and receiving elements of electronic television.

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Zworykin’s most critical invention was the first iconoscope camera tube, which he patented in 1923. The key to its success was the fact that its silvered-mica photocathodes stored the charges induced by the image that was focussed on them until the scanning electron beam simultaneously neutralized the charges and modulated itself.
A year after he invented the iconoscope, Zworykin invented the kinescope - a TV picture tube - thus becoming responsible for both the key transmitting and receiving elements of electronic television.

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The technical problems of colour television have been solved long ago - a German patent for the transmission of images in colour was taken out by the physicist, Otto von Bronk, as far back as 1902 - but the high cost of the equipment, especially receivers, has held up its general introduction. In America, television programmes in colour have been transmitted since the early 1950’s to a limited number of viewers who can afford the extra cost, and an experimental service began in Britain in 1955. Japan started its regular colour service in the autumn of 1960: a year later there were already 15,000 receiving sets in operation, although the price of a colour set was still eight times as much as that of a black-and-white receiver. Then the Soviet Union, too, has introduced a colour television service.

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No doubt colour television will eventually supersede black-and-white transmissions. But there are other revolutionary developments to come, such as the “flat” screen - it will replace the conventional receiver box with its cathode-ray tube. The first screen, which can be hung on the wall like a picture, may be no more than 2 to 3 inches thick. It has a fluorescent coating like conventional tubes, but the electrons from the cathode move almost parallel with it instead of striking it at a right angle. They start their journey from an electronic “gun” at the top behind the screen, shooting downwards; at the bottom they are reflected by a “reversing lens” to travel vertically upwards along the screen, which they eventually hit by the influence of a grid of conductors which accumulate electric charges from the electron beam and give them off to the screen. The flat screen will be especially suitable for colour reception.

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A solid-state television camera that can be made so small it fits into the palm of a hand is available at present.
At the heart of this camera is a light-sensitive semiconductor “chip” - half the size of a postage stamp. It receives and transmits images coming through the lens in much the same way that a 5-inch long (12.5 cm) tube does in today’s cameras. The device, though complex in principle, promises to simplify the basic television camera so that low-cost, live TV should some day be common in industry and the home.

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For television fans who can’t make up their minds about which station to watch, a Taiwanese manufacturer has come up with a solution. The firm has introduced a three-screen television set. The unit features a 19-inch (47.5 cm), colour screen flanked on one side by a pair of 5-inch (12.5 cm), black-and-white screens mounted one above the other. Three channels can be watched at once, and using a remote control a viewer can rotate simultaneous broadcasts from one screen to another simply by pressing a button. One or both of the similar screens can also be hooked up to a closed-circuit camera, thus functioning as a security-surveillance monitor.