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¿Por qué en el experimento de Frank-Hertz no se aprecian otras caídas de corriente correspondientes a la excitación del átomo de mercurio al segundo estado excitado, tercer estado excitado, etc.?

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10.¿Por qué en el experimento de Frank-Hertz no se aprecian otras caídas de corriente correspondientes a la excitación del átomo de mercurio al segundo estado excitado, tercer estado excitado, etc.?


Solución de las preguntas capitulo 4 del libro de fisica moderna Serway 3 edicion

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Solucionario del Libro de Metodos matematicos para la fisica e ingenieria de Riley

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Solucionario del Libro de Metodos matematicos para la fisica e ingenieria de Riley tercera edicion(Student solution manual for mathematical methods for physics and engineering third  edition)  


Download English Unlimited Upper Intermediate Coursebook

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Product descriptionEnglish Unlimited is a six-level (A1 to C1) goals-based course for adults. Centred on purposeful, real-life objectives, it prepares learners to use English independently for global communication.

Through universal topics and activities, and a focus on intercultural competence as a 'fifth skill', this international coursebook helps learners become more sensitive, more effective communicators.

Teaching natural, dependable language, and with CEF goals at its core, it brings real life into the classroom and gives learners the skills and strategies to communicate confidently outside it.

Explore sections provide the extra ingredients for enhancing communicative ability, from further development of speaking skills to independent learning strategies.

The e-Portfolio DVD-ROM enables learners to create a 'can-do' record of their work and progress. It also provides reference tools and a vocabulary trainer.





BOOK:

Download English Unlimited Advanced Self-study Pack C1,coursebook free

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Product descriptionEnglish Unlimited is a six-level (A1 to C1) goals-based course for adults. Centred on purposeful, real-life objectives, it prepares learners to use English independently for global communication.

The Advanced Self-study Pack consists of a Workbook with DVD-ROM. It enables learners to consolidate and build upon work done in class.

The Workbook provides extra 'Explore Writing' tasks plus a complete 'Explore Reading' syllabus, as well as 'Over to you' exercises allowing personalisation of language practice.

In addition to over 300 interactive practice activities, the DVD-ROM includes authentic video, including 'made for TV' short films and documentaries, a self-recording and playback tool for pronunciation practice, animated clips offering speaking practice in everyday situations, and customisable 'QuickCheck' tests to monitor progress.

BOOK:

500 Words, Phrases, Idioms for the TOEFL iBT.pdf

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HOW IS THIS TOEFL BOOK DIFFERENT? This TOEFL book is different because it uses an integrated vocabulary learning system called recycling. Recycling is simple. Each exercise is divided into four quizzes. Quiz 1, a multiple-choice vocabulary quiz, introduces ten new words. Next, you will do Quiz 2. Quiz 2 is a sentence-completion quiz based on the ten words in Quiz 1. Next, you will do Quiz 3, a spelling quiz. The speaker on the CD will say the same ten words in turn. You will then have ten seconds to spell each word by saying it and typing it. Finally, you will do Quiz 4. Quiz 4 is a 60-word typing test based on the ten new words you have been recycling through Quizzes 1, 2 and 3, plus words, phrases and idioms recycled from previous exercises. BONUS MATERIAL Learn essential rhetorical strategies and a test-proven way to develop opinion-based and fact-based TOEFL essays.



BOOK:

download 500 Basic Korean Verbs for free online

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This is a complete study guide to the most common Korean verbs
Korean grammar is notoriously difficult for foreigners to master but is essential for those wishing to learn Korean. Easy-to-use 500 Basic Korean Verbs is the only comprehensive guide to the correct usage of Korean verbs available for English-speaking learners. 

Each of the 500 most important Korean verbs is presented in a convenient single-page format that gives the verb's meaning and pronunciation, and displays the verb's 48 key tenses, speech levels, and moods (all accompanied by romanizations). Also included are a handy guide to the Korean language and verb conjugation and reference tables of basic Korean verb types, along with 3 indexes (Romanized, Hangeul, and English). 




500 Basic Korean Verbs Includes:
Conjugations by tense, speech levels, and mood."Model verb" system quickly identifies each verb's pattern.Sample sentences demonstrating the verb's correct usage.Free downloadable audio provides …