In which year Invention of radio?

Answer 1

That honour could be said to go to Karl Jansky (1905-1950). In 1932 he was working for the Bell Telephone labs on a project to identify possible sources of interference on shortwave radio links. While he was doing this he noticed a hiss in his radio receiver that would appear and peak once a day. His first thought was it was the Sun, however it kept sidereal time (that is it peaked 4 mins earlier each day), which suggested an astronomical source. He eventually identified the source as being in the constellation of Saggitarius. We now know that the radio hiss was coming from the centre of our galaxy. Bell were not interested in following up on his discovery so Jansky did not take it any further. But it was taken up by Grote Reber. He built a parabolic dish aerial, the sort most people associate with radio astronomy. Reber went on to create a radio map of the sky, so he was probably the first true radio astronomer.

Answer 2

Radio Telescopes were officially discovered and invented by Karl G. Jansky in 1931. His radio telescope was a series of arms that spun around with the intention of detecting radio frequency interference during a thunder storm. However, as time progressed he realized that his "radio telescope" was detecting static which he could not account for.

He also discovered that each day the static peaked four minutes earlier, ruling out his original explanation as the source being the sun. Astronomers refer to a stellar day (which is typically four minutes shorter than a solar day) as a sidereal day.

Not being an astronomer himself, it took Jansky a while to surmise that the source of his static was in fact of Extraterrestrial origin. With further study he discovered the source to be the milky way galaxy and in 1933 published his findings in a scientific journal.

However his research was largely ignored by the scientific community until in 1937 when Grobe Reber picked up where Jansky left off and built the prototype of what we now know to be a radio telescope in his back yard in Wheaton, Illinois. At first he began looking for radio waves at shorter wavelengths, with little to no success. He later increased his target wavelengths to 1.87 meters where he located strong radio emissions along the Milky Way.

Reber continued his research up until 1944, when he published his own scientific findings. Despite this, it wasn't until after World War 2 that Radio Waves were explored in depth, since the Allies had discovered radio interference from the sun on their radars.

The first really effective radio telescope was the "One Mile Telescope" at Cambridge. It used a series of eight movable dishes mounted along a disused railway track, and was developed by Sir Martin Ryle, a Cambridge professor, in 1965. The first steerable parabolic dish, resembling a conventional astronomical telescope but 76 m across, was built at Jodrell Bank in Cheshire, largely by Sir Bernard Lovell, in 1965. It was very expensive, but it was worth it, because it permitted radioastronomy to become a real science.

Answer 3

Dr. Karl G. Jansky was an American physicist and radio engineer, considered one of

the founding figures of radio astronomy. In August 1931, while scanning for sources

of radio static such as thunderstorms, he first discovered radio waves emanating

from the Milky Way. From then on, radio antennas and receiver configurations were

built for the intent and purpose of collecting energy from space at radio wavelengths.

Answer 4

It is astronomy that looks not at visible light, but lower in the electromagnetic spectrum where there are radio waves instead of light. In 1931 Carl Jansky discovered radio 'noise' coming from the centre of the galaxy in Sagittarius, and since then many discoveries have been made with large dish antenna 'telescopes' like the one at Jodrell Bank in the UK, for example pulsars discovered in 1967 by Jocellyn Bell which are quickly rotating neutron stars.

Answer 5

Radio waves are a type of electromagnetic radiation, similar to visible light but the waves are much longer. The visible light parts of the electro-magnetic spectrum have wavelengths between around 380 and 780 nanometres, with red light having a wavelength of around 700 nanometres. Outside this range, light becomes invisible, with infrared light having a wavelength greater than 780 nanometres. Radio wave have much longer wavelength, from a few centimetres to hundreds of metres or more. Radio telescopes are designed to pick up these radio waves which come from various objects in space. By focusing on points and mapping out the intensity, pictures can be assembled to show what might be happening, details that could not be captured in the visible light range.

The idea of detecting interstellar radio waves was theorised in the 1860's but it wasn't put into practice until the 1930's, by Karl Jansky , with further developments in the 40`s and 50`s by Grote Reber, J.S. Hey, Martin Ryle and Antony Hewish

Answer 6

In 1893 Nikola Tesla first demonstrated the principles of wireless communications.

Answer 7

i think that Galileo invented it

Answer 8

radios were first used in the 1909

Answer 9

Grote Weber