Hi Physics Do Not Write on This Question Sheet! Lab Quiz Postlab Quiz- Interfere

Question

Hi Physics Do Not Write on This Question Sheet! Lab Quiz Postlab Quiz- Interference of Light 121. The diffraction grating used in the experiment has 678 rulings per mm. What is the distance separation of this diffraction grating? (A) 0.0015mm 122. After a laser shines through the diffraction grating of 3.2um distance separation, a distance between a (B) 158mm (C) 147mm (D) 1.58e-6m (E) 1.47um bright fringe and the central fringe was measured, then, the sin of an angle at which the corresponding bright fringe is observed was calculated based on the measured values. To analyze the results, sino was plotted against the fringe order. Calculate the wavelength of the light from the slope of the graph. sin ? vs. m y 0.2007x Graph 1: Sin(®) vs. fringe order (A) 642 m (B) 642 nnm (C) 627 m (D) 627 nm (E) 692 ??? 123. In the experiment described in question #2, the diffraction grating was gradually moved further away from the screen. How did this action affect the interference picture? (A) It did not affect either the number of bright spots on the wall or the distance between them (B) It did not affect the number of bright spots on the wall but increased the distance between them (C) It did not affect the number of bright spots on the wall but decreased the distance between them (D) It changed the number of bright spots on the wall but not the distance between them 124. A laser of 690nm hits a hair strand. This forms a pattern of alternating bright and dark lines on the screen. After measuring the distance from the central bright line to each m dark line and the angle at which the dark line is observed, the graph sinO vs. m was built. What is the thickness of the hair, if the trendline equation of the graph is Y 0.012 x? (D) 73.4um (E) 157um (A) 57.5um (B) 575pm (C) 87.6?m 125. A green laser light of 485nm is shot directly through a diffraction grating of a distance separation 1.6E-6m. What is the total number of bright spots seen on the wall? 13 (C) 9 (D) 11 (B) 7 (A) 5

Explanation / Answer

121. Distance separation of the grating is given by

d = 1/number of lines per mm

= (1/678) mm = 0.001474 mm = 0.0015 mm

So, option (A).

Related Questions

Navigate

• Browse (All)
• Browse H
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.