Adouble-slit arrangement produces bright interference fringes for sodium light ( λ = 603 nm) that are angularly separated by 0.49° near the center of the pattern. what is the angular fringe separation if the entire arrangement is immersed in water, which has an index of refraction of 1.33?

θ for water = 0.3684°

Explanation:

given data

wavelength  λ = 603 nm

angle θ = 0.49°

index of refraction n =  1.33

to find out

angular fringe separation

solution

we know that double slit interference is here

m λ = d sin(θ)    .................1

so for air it will be

m λ(air) = d sin(θ)air        ...........2

and for water it will be

m λ(water) = d sin(θ)water       .............3

now we take here ratio of equation 2 and 3

=      

and

ratio of wavelength is =

ratio of wavelength  =

ratio of wavelength  = 0.75187

so

sin(θ)water = sin(θ)air (0.75187)

sin(θ)water = sin(0.49) (0.75187)

sin(θ)water = 0.006429

so (θ)water  is

(θ)water = 0.3683°

we notice here that by using small angle formula

we have approximate sin(θ) = θ

so θ for water is =

θ for water =

θ for water = 0.3684°

nec chapter 5 contains

c. information on special occupancy areas

nec chapter 6 covers

a. special equipment

which of the following rules contain the words shall or shall not and must be adhered to?

b. mandatory rules

which of the following rules identify actions that are allowed but not required and typically cover options or alternative methods?

c. optional rules

which of the following serves as the introduction to the nec and provides an overview of the book?

a. nec article 90

organizations that test products for safety are

c. nrtls

the nec is published by the

a national fire protection association

the nec is divided into

b. 9 chapters

the nec provides informative annexes for

c. informational materials and examples

two terms from nec article 100 that trainees should become familiar with are

b. labeled and listed

explanation: