Gce Model Questions Vol1 2022 Physics Question 19

Practice objective / multiple choice question 19 from the 2022 Gce Model Questions Vol1 Physics examination.

Gce Model Questions Vol1 2022 Physics Objective / Multiple Choice Medium Difficulty
Question 19 GCE_MODEL_QUESTIONS_VOL1 • 2022 • PHYSICS • objective

A diffraction grating has 5000 lines cm⁻¹. Monochromatic light of unknown wavelength produces a second‑order maximum at an angle of \(30^{\circ}\). (a) Find the wavelength of the light. (b) The grating is replaced by one with 6000 lines cm⁻¹. Calculate the angular separation between the second‑order maxima for the original wavelength and for a wavelength that is 5 % longer. (c) What is the minimum number of illuminated slits required for the grating to resolve these two wavelengths in the second order?

Answer Options

A. (a) 520 nm; (b) ≈ 2.5° separation; (c) minimum 12 illuminated slits
B. (a) 480 nm; (b) ≈ 1.8° separation; (c) minimum 8 illuminated slits
Correct Answer C. (a) 500 nm; (b) ≈ 2.2° separation; (c) minimum 10 illuminated slits
D. (a) 500 nm; (b) ≈ 3.0° separation; (c) minimum 15 illuminated slits
Correct Answer
C
Correct Option:
(a) 500 nm; (b) ≈ 2.2° separation; (c) minimum 10 illuminated slits

About This Question

This is Gce Model Questions Vol1 2022 Physics Question 19. It is one of the objective questions from the 2022 Gce Model Questions Vol1 Physics examination.

Difficulty level: Medium .

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