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No more Local Hero

No more Local Hero
By Mark Mason on 18-09-13 10:52. Comments (0)

*This post dates from September 2013. What I hadn't realised then was that the English people it mentions all have votes in the referendum.*

One year to go, as you may have noticed in The Media, until the independence referendum in Scotland. I'd hardly been north of Edinburgh before my Land's End to John O'Groats trip, so was amazed at something I encountered in the fishing villages past Inverness. It made me realise that, whatever certain politicians and commentators might say, the question isn't as simple as ‘England vs Scotland'. Here's the relevant bit from the book:

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Big Ben

On a visit to Big Ben, I was told that if you stand at the bottom of the tower with a portable radio and listen to the chimes on Radio 4 (they still transmit them live), you hear them on the radio before you hear them ‘for real’. I couldn’t believe it – but was intrigued enough to try it for myself. And you know what? It’s absolutely true. The bongs come out of the radio a fraction of a second before they reach your ears from the top of the tower. It’s something so silly, so counter-intuitive, that you have to tell people. (Well, I did.) Researching the explanation, I found that it’s because radio waves travel at the speed of light (186,000 miles per second) rather than the 700 or so miles per hour at which sound waves travel. The signal travelling down the wire from the microphone to the BBC goes at the speed of light too. Hence the radio version overtaking the real one.

I realised that this would be the perfect way to teach the principle in school physics lessons. Instead of a boring teacher droning on that ‘radio waves travel at the speed of light’, illustrate it with this beautiful and quirky little fact. The kids will remember it then. I certainly would have done if my physics teacher had taken this approach. As it was I had to wait until I heard a piece of so-called ‘trivia’ in my thirties.