Предмет: Химия, автор: kazionow

C2H6+C2H4= что получится?

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Автор ответа: Анетка125
0
Алканы с алкенами не взаимодействуют
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Предмет: Английский язык, автор: olga197111
Переведите точно текст на русский язык.
JAMES MAXWELL

In the decade 1860–1870, James Maxwell formulated his classical
electromagnetic theory. He showed that light was a form of wave motion travelling
with a speed dependent on the electric and magnetic properties of the medium
through which it is transmitted, lie also predicted that waves longer than those of light
could exist.
Even before Maxwell advanced the theory that electromagnetic waves should
exist, men were making use of them for other purposes besides vision. For instance,
the short ultraviolet rays in sunlight provided suntans; and the heat of the sun –
provided by the long infra-red rays – was often concentrated by means of a lens to
start fires. After the existence of electromagnetic waves had been proved by Hertz it
was discovered that they range in length from hundreds of miles down to less than a
billionth of an inch. The long waves could be used to carry sounds through space; as
a consequence radio was developed.
A more recent development, which is related to radio, is television. Not only
sounds but pictures can be transmitted at a distance because of electromagnetic
waves.
Another modern device, developed to send out electromagnetic waves and to
receive the echoes when they return, is radar, since the speed of electromagnetic
waves is known, the time it takes for an echo to return to the radar set can tell the
operator how far away a plane is from his set. Radar is given the credit for saving
Great Britain during World War II, for it warned of enemy planes. Thus James
Maxwell had made discoveries that later protected his homeland. Today with radio,
television, radar, and communication with outer space making use of these waves, it
is easy to realize why James Maxwell is now considered one of the great scientists of
all time.