January 2019 1 15 Report
1. Wykaz energie elektronu 8,4*10^-19J w elektrowoltach
^ =potęga
2.Praca wyjscia elektronów z płytki miedzianej wynosi 4,65 eV. Oblicz najmniejszą czestotliwosc promieniowania powodujacego fotoefekt na tej plytce.
3.Wiazka swiatla ma energie 4J i zawiera 10^19 fotonow. Oblicz dlugisc tej fali (w nanometrach)
4.Na płytke o pracy wyjacia 3eV pada wiazka promieniowania 6*10^5 eV skladajaca sie z fotonow o energii 6eV. Ile fotoelektronow zostanie wyeliminowanych
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Prawda czy fałsz? Hi Mike!I’ve just had the most fantastic experience of my life. We went to Lapland! It was a school trip (one week instead of school) and it was fantastic. We went reindeer spotting with a Sami guide. He took us into the tundra where we walked for ages in the freezing cold, but suddenly, in the middle of all the empty snow, we saw a huge herd of reindeer.We visited a Sami camp too. We saw people making knives and leather clothes and houses – all from reindeer. Their houses seemed really warm and comfortable. We also went on a sled ride with husky dogs – with a driver. We went really fast and it was so exciting, and guess what – we found Father Christmas. He was hiding behind a tree (only joking!).One afternoon we drove north and stayed there deep in the Arctic Circle. We didn’t experience the midnight sun – that only happens in summer – but we saw the most amazing Northern Lights. They were fantastic, absolutely stunning. You see so many colours dancing around the sky.But I think the best thing was we stayed in an ICE hotel. Can you believe it … a hotel made just of ice? You sleep on ice beds, you sit on ice chairs … OK, with reindeer skins on top, and don’t worry – the hotel’s a nice, warm –5C! The hotel’s in a place called Jukkasjarvi. It’s very small and quiet with just a museum and a restaurant. But the museum’s really interesting. It has an exhibition about the Sami way of life.This was absolutely the best trip I’ve ever been on. Go there too – you really must.LoveHannah1 Hannah went to Lapland in the school holidays. True / False2 They didn’t find the reindeer quickly. True / False3 Hannah liked the Sami houses. True / False4 Hannah drove a sled. True / False5 She saw Father Christmas. True / False6 They visited the Arctic Circle in the summer. True / False7 Hannah was frightened by the Northern Lights. True / False8 Hannah’s favourite thing was the ice hotel. True / False9 The hotel wasn’t really warm. True / False10 Jukkasjarvi is an exhausting place. True / False
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