Physics, 21.12.2019 06:31 cadenm81

You are comparing two diffraction gratings using two different lasers: a green laser and a red laser. you do these two experiments

1. shining the green laser through grating a you see the first maximum 1 meter away from the center
2. shining the red laser through grating b, you see the first maximum 1 meter away from the center

in both cases, the gratings are the same distance from the screen.

(a) what can you deduce about the gratings?
(b) what would you observe if you shone the green laser through grating b: ?

a. (a) grating a has more lines/mm; (b) the first maximum less than 1 meter away from the center
b. (a) grating b has more lines/mm; (b) the first maximum less than 1 meter away from the center
c.(a) grating b has more lines/mm; (b) the first maximum more than 1 meter away from the center
d. (a) grating b has more lines/mm: (b) the first maximum 1 meter away from the center
e. (a) grating a has more lines/mm; (b) the first maximum more than 1 meter away from the center
f. (a) grating a has more lines/mm; (b) the first maximum 1 meter away from the center

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Answer from: maggie123433

a. (a) grating A has more lines/mm; (b) the first maximum less than 1 meter away from the center

Explanation:

Let n₁ and n₂ be no of lines per unit length of grating A and B respectively.

λ₁ and λ₂ be wave lengths of green and red respectively , D be distance of screen and d₁ and d₂ be distance between two slits of grating A and B ,

Distance of first maxima for green light

= λ₁ D/ d₁

Distance of first maxima for red light

= λ₂ D/ d₂

Given that

λ₁ D/ d₁ = λ₂ D/ d₂

λ₁ / d₁ = λ₂ / d₂

λ₁ / λ₂ = d₁ / d₂

But

λ₁ < λ₂

d₁ < d₂

Therefore no of lines per unit length of grating A will be more because

no of lines per unit length ∝ 1 / d

If grating B is illuminated with green light first maxima will be at distance

λ₁ D/ d₂

As λ₁ < λ₂

λ₁ D/ d₂ < λ₂ D/ d₂

λ₁ D/ d₂ < 1 m

In this case position of first maxima will be less than 1 meter.

Option a is correct .

Answer from: Quest

answer: question1

1,000 tons

question2

3: 8

question 3

store d

step-by-step explanation:

Answer from: Quest

Is a vector quantity that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

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