Chapter3.ppt
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1. The document discusses spectral lines in stars and the emission and absorption of light by elements. 2. It explains that each element has its own unique spectrum which can be seen in absorption lines in the Sun's spectrum and describes how Gustav Kirchhoff discovered absorption lines of hydrogen. 3. It also covers the Bohr model of the hydrogen atom and how it was used to derive the Rydberg formula to explain the emission spectrum of hydrogen.
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The Golden Group is over. Can a new group step up? Two years ago, Kevin De Bruyne plunged Belgium’s Euro 2024 plans into disorder when he claimed the team was “too old” to win in an interview with The Protector. That Belgian squad had 10 players over 30 and the maximum average age of any Euro Cup 2024 team at the competition. A group-stage exit and just one goal at the World Cup put Belgium on course for a restructure.
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Coach Domenico Tedesco has managed a tactical shakeup and a regular exit for some of the oldest players. Experienced bests remain, not least the 37-year-old Jan Vertonghen in defense, the 32-year-old De Bruyne himself in midfield, and 31-year-old Romelu Lukaku up visible.
Still, younger actors like De Bruyne’s Manchester City partner Jeremy Doku bring fresh vitality to the team. Euro Cup Germany Qualifying unbeaten with just four goals allowed from eight games was a welcome sign of accomplishment back on track under Tedesco.
The only other squad in Group E besides Belgium to UEFA Euro 2024 qualify unbeaten, Romania was awestruck by winning a group that also checked Switzerland and Israel. Still, Euro 2024 will test a squad sorely lacking in top-level skill.
Euro 2024: Belgium's Transition from Golden Generation to New Hope
Tottenham guardian Vlad Dragusin is the only Euro Cup 2024 squad member singing regularly for one of Europe’s top clubs this flavor. He even played only nine Premier League games since adoption in January. Goalkeeper Horatiu Moldovan is a stoppage at Atletico Madrid.
There’s a link to the beauty days of Romanian soccer with midfielder Ianis Hagi, son of Gheorghe Hagi, who assisted the team to the rounds of the 1994 World Cup and Euro 2000.
We are only a combine of days away from the UEFA Euro 2024 curtain raiser. The 24 squads are winding up their provisions and getting ready to give it their all to life the wanted Euro Cup Final trophy on July 14. Spread across six clusters, the first hurdle in the knockout phase will be the plump of 16.
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Germany and Scotland will take things off before we get into overdrive in two weeks. Meanwhile, Belgium will be longing to bounce back after a horrendous 2022 FIFA World Cup movement, which ended in the group stage.
Belgium vs Romania Tickets | Euro Cup 2024 Tickets | Euro Cup Tickets | Euro Cup Final Tickets
Roberto Martinez completed the way for Domenico Tedesco, who has overseen a compact start to his tenure. The 38-year-old will be assured heading into the group stage
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Italy are the defending European champs, but after Luciano Spalletti swapped Roberto Mancini last September, they are still taking the cautious first steps of a new era
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Football World Cup enthusiasts worldwide can secure their FIFA World Cup 2026 Tickets through our online platform, eticketing.co. With a user-friendly interface and exclusive deals, fans can effortlessly book FIFA World Cup Tickets for thrilling matches, all at discounted prices.
Euro 2024 Key Tactics and Strategies of the Netherlands.docx
We offer Euro Cup Tickets to admirers who can get Netherlands vs Austria Tickets through our trusted online ticketing marketplace. Eticketing.co is the most reliable source for booking Euro Cup Final Tickets. Sign up for the latest Euro Cup Germany Ticket alert.
Euro Cup Group E Preview, Team Strategies, Key Players, and Tactical Insights...
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Chapter3.ppt
- 2. Emission and absorption of light Emission line spectrum Continuous spectrum (thermal, blackbody) Independent of composition Dependent on composition
- 3. Each element has its own unique spectrum
- 4. Absorption lines in the Sun’s spectrum
- 5. Absorption Line Spectrum Gustav Kirchhoff (1824-1887)
- 6. absorption lines of hydrogen
- 7. Emission Line Spectrum • Produced by a low- density gas • depends on composition and temperature
- 9. The Balmer series for hydrogen: Visible light electrons falling to n=2 Rydberg formula (Balmer for nf = 2) : 1 / = R (1/nf 2 - 1/ni 2) R = Rydberg constant = 1.097 x 107 m-1
- 12. Energy levels and transitions of the many-electron atom: Sodium Quantum states of the valence electron
- 13. The Bohr Model • Classical physics predicts that the electron should spiral into the nucleus • Cannot explain emission spectra
- 14. The Bohr model: •The e- stays in certain stable orbits, emits no radiation unless it jumps to a lower level •The angular momentum of the e- is quantized •the attaction between p and e- provides the centripetal acceleration n = principal quantum number
- 15. From Coulomb’s law, the force between the proton and electron is F = 1 40 q1 q2 r2 This is the centripetal force, mv2 / r Where q1 = q2 = e for the hydrogen atom
- 16. Bohr radius a0 = 0h2 / me2 = 5.29 x 10-11 m So when the electron is in any energy level n: KE of the electron in the nth level: Kn = 1/2 mv2 -1 40 e2 r PE of the electron in the nth level: Un = Total energy En = Kn + Un = ??? Compare to Rydberg formula!
- 17. Reduced mass: the nucleus is not infinite in mass, Bohr model is off by 0.1% mr = m1 + m2 m1 m2 isotopes
- 18. Ionized Helium is also a 1-electron atom
- 19. Why is the emission spectrum of ionized helium similar to that of hydrogen? 1. Because hydrogen and helium are similar chemically 2. Because several of the energy levels of hydrogen and helium are the same 3. Because hydrogen and helium have similar atomic masses 4. It is a total coincidence
- 20. Energy Level Transitions Allowed Not Allowed • Continuum • Ionization • Differences between elements • isotopes
- 23. Is this star hotter or cooler than the Sun?
- 27. Temperature Luminosity The Hertzsprung- Russell diagram plots the luminosity vs. temperature of stars
- 28. B - V is a measure of color: the smaller B-V, the hotter the star (magnitudes, remember!)
- 32. Lines in a star’s spectrum correspond to a spectral type that reveals its temperature (Hottest) O B A F G K M (Coolest)