Chap 3 - diffraction / Interférences / Doppler
Quiz
•
Physics, Chemistry
•
12th Grade
•
Practice Problem
•
Medium
laurent rimbourg
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13 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Quel mot définit le mieux le phénomène de diffraction ?
décalage
superposition
élargissement
ralentissement
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Dans la relation de l'ouverture angulaire θ = L / (2*D) , que représente la lettre L ?
La largeur de la fente diffractante
la distance fente / écran
la moitié de la largeur de la tache centrale de diffraction
La largeur de la tache centrale de diffraction
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Comment évolue la largeur de la tache centrale de diffraction si on remplace le laser rouge (650 nm) par un laser vert (500 nm) ?
Elle augmente.
Elle reste inchangée.
Elle diminue.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Quelle est l'expression de la tan(θ) ?
tan(θ)= D / (2*L)
tan(θ) = D*L / 2
tan(θ) = L / D
tan(θ)= L / (2*D)
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
On peut montrer par l'expérience que l'ouverture angulaire θ de la tache de diffraction est égale à θ = λ/a . Que représente la lettre a ?
la largeur de la tache centrale de diffraction
la largeur de la fente diffractante
la distance fente / écran
la moitié de la largeur de la tache de diffraction
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Quel mot définit le mieux le phénomène d'interférences ?
élargissement
superposition
décalage
ralentissement
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
les sources qui interfèrent doivent être cohérentes. Que signifie ce terme ?
monochromatique.
monochromatique et en phase.
être allumées au même moment.
en phase.
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