Radiation
In Our Time12 Marras 2009

Radiation

Melvyn Bragg and guests Jim Al-Khalili, Frank Close and Frank James discuss the history of the discovery of radiation.Today the word 'radiation' conjures up images of destruction. But in physics, it simply describes the emission, transmission and absorption of energy, and the discovery of how radiation works has allowed us to identify new chemical elements, treat cancer and work out what the stars are made of.Over the course of the 19th century, physicists from Thomas Young, through Michael Faraday to Henri Becquerel made discovery after discovery, gradually piecing together a radically new picture of reality. They explored the light beyond the visible spectrum, connected electricity and magnetism, and eventually showed that heat, light, radio and mysterious new phenomena like 'X-rays' were all forms of 'electromagnetic wave'. In the early 20th century, with the discovery of radioactivity, scientists like Max Planck and Ernest Rutherford completed the picture of the 'electromagnetic spectrum'. This was a cumulative achievement that transformed our vision of the physical world, and what we could do in it.Jim Al-Khalili is Professor of Theoretical Physics and Chair in the Public Engagement in Science at the University of Surrey; Frank Close is Professor of Physics at Exeter College, University of Oxford; Frank James is Professor of the History of Science at the Royal Institution.

Jaksot(1078)

The Evolution of Lungs

The Evolution of Lungs

Melvyn Bragg and guests discuss the evolution of lungs and of the first breaths, which can be traced back 400 million years to when animal life spread from rock pools and swamps onto land, as some fis...

10 Heinä 202548min

The Vienna Secession

The Vienna Secession

In 1897, Gustav Klimt led a group of radical artists to break free from the cultural establishment of Vienna and found a movement that became known as the Vienna Secession. In the vibrant atmosphere o...

3 Heinä 202554min

Hypnosis

Hypnosis

Ever since Franz Anton Mesmer induced trance-like states in his Parisian subjects in the late eighteenth century, dressed in long purple robes, hypnosis has been associated with performance, power and...

26 Kesä 202545min

Paul von Hindenburg

Paul von Hindenburg

Melvyn Bragg and guests discuss the life and role of one of the most significant figures in early 20th Century German history. Paul von Hindenburg (1847-1934) had been famous since 1914 as the victori...

19 Kesä 202552min

Copyright

Copyright

In 1710, the British Parliament passed a piece of legislation entitled An Act for the Encouragement of Learning. It became known as the Statute of Anne, and it was the world’s first copyright law. ...

12 Kesä 20251h

Lise Meitner

Lise Meitner

Melvyn Bragg and guests discuss the decisive role of one of the great 20th Century physicists in solving the question of nuclear fission. It is said that Meitner (1878-1968) made this breakthrough ov...

5 Kesä 202557min

The Korean Empire

The Korean Empire

Melvyn Bragg and guests discuss Korea's brief but significant period as an empire as it moved from the 500-year-old dynastic Joseon monarchy towards modernity. It was in October 1897 that King Gojong ...

29 Touko 202547min

Molière

Molière

Melvyn Bragg and guests discuss one of the great figures in world literature. The French playwright Molière (1622-1673) began as an actor, aiming to be a tragedian, but he was stronger in comedy, tour...

22 Touko 202551min

Suosittua kategoriassa Historia

olipa-kerran-otsikko
gogin-ja-janin-maailmanhistoria
mayday-fi
huijarit
mystista
tsunami
totuus-vai-salaliitto
rss-ikiuni
konginkangas
rouva-diktaattori
rss-subjektiivinen-todistaja
rss-i-dont-like-mondays-2
sotaa-ja-historiaa-podi
rss-peter-peter
tiedetta-ja-sirkushuveja-vanhojen-aikojen-podcast
rss-kirkon-ihmeellisimmat-tarinat
rss-iltanuotiolla
maailmanpuu
romani-podcast
rss-sattuu-sita-suomessakin