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W pojemniku są 4 kule białe i 6 czarnych. Losujemy 2 kule bez zwracania. Ile jest możliwości wylosowania co najmniej jednej czarnej kuli?

Jaki to wynik : ln(1-0,87)/0,019 =

Put the verbs in brackets into past perfect. 1. They …………already ………………….(reserved) the table before they went to the restaurant. 2. .Why did Bill have to use a wheelchair? Because he ………...……………...(injure) his leg. 3. A: Did you do anything last night? B: I spent some time at the gym and I ……..just …………….arrived home when Mike called me. He said he ……………….(try) to call me before but I didn’t answer…. 4. Moira started cleaning after all the guests …………………...(leave). She was glad that her birthday party ………………….(be) fun for everyone. She put all the presents her friends ……………………………….(give) her on her bedside cupboard. 5. A: Was the house tidy when you got home? B: Yes, the kids …………………..(dust) the furniture and they ………………….(put away) all of their toys. 6. Andy was relieved to hear that he …………………….(pass) the exam. 7. Helen and Jeff were ashamed that they ……………………….(not visit) their parents for a long time. 8. Brian ………………...….(learn) to drive before he got his first identity card. 9. Daniel missed the bus because he …………………...(spend) too much time having breakfast. 10. Hannah felt sick after she ………………………..(eat) too much chocolate. 11. Maggie ………………………..(drink) a cup of warm milk before she went to bed. 12. I needed a minute in quiet because I ……………..(have) a very unpleasant incident before. Homework: II. Complete the following sentences with proper forms of the verbs in brackets. 1. No one believed Marcus because he ………. often …………..(lie)before. 2. They werent’t surprised at all. ……………they ……………….(hear) the news earlier? 3. John wasn’t there when I came. He …………………..(not turn up) yet. 4. I first met Lucy at your party. I ……...never …………….(see) her before. 5. We arrived at the theatre late (what a shame!). The play ………. already ………...…...(begin). 6. Jade was very hungry; she …………………………...(not eat) breakfast or lunch. 7. There were black flags in front of the government building last week. …... anyone ……….(die)? III. Explain the situations below using the cues and the past perfect. Then add another possible explanation. Wyjaśnij poniższe sytuacje, korzystając z sugestii i czasu zaprzeszłego. Następnie dodaj inne możliwe wyjaśnienie. Example: The building exploded. (gas pipe / burst. The building exploded because a gas pipe had burst. The building exploded because a terrorist had put a bomb there. 1. A famous pop group split up. (their last album / be unsuccessful) …………………………………………………………………………………………………………………………………………………………………………………………………………………... 2. A young man started stealing. (he / lose his job) …………………………………………………………………………………………………………………………………………………………………………………………………………………… 3. The dog hid under the sofa. (he / eat family dinner) …………………………………………………………………………………………………………………………………………………………………………………………………………………… 4. A car crashed into a tree. (driver /fall asleep) …………………………………………………………………………………………………………………………………………………………………………………………………………………… 5. The Smiths went on a round-the-world trip. (Mr.Smith / get a pay rise) ……………………………………………………………………………………………………………………………………………………………………………………………………………………

Bańka mydlana o grubości ścianek 100 nm⁠ jest oświetlona światłem białym, padającym prostopadle do jej powierzchni. Dla jakiej długości fali z zakresu widzialnego i dla jakiego koloru światła, który jej odpowiada, uzyskana zostanie konstruktywna interferencja? Przyjmij, że współczynnik załamania roztworu mydła jest taki sam jak wody.