Aparallel beam of light from a laser with a wavelength 450 nm, falls on a grating whose slits are 1.28 x 10^-4 cm apart. how far (in cm) is the 1t order bright spot from the center of the pattern on a screen 3.4 m away?

Y_1 = 1.195 m = 119.5 cm

Explanation:

For nth order bright fringe, the distance from the center of the pattern is given by :-

Where,

n = order of nth  bright fringe. = 1

wavelength of  given light  =  

D = distance between the screen and slits. =  3.4 m

and d = separation between the slits.

Y_1 = 1.195 m = 119.5 cm

pecialized keyboards

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m