Which of the following changes would increase the seperation between the bright fringes in the diffraction...
Which of the following changes would increase the seperation between the bright fringes in the diffraction pattern formed by diffraction grating?
A. INCREASE THE WAVELENGTH OF THE LIGHT
B. IMMERSE THE APPARATUSE IN WATER
C. INCREASE THE SEPERATION BETWEEN THE SLITS
D. NONE OF THESE
E. MORE THAN ONE OF THESE
Homework Answers
The equation for diffraction grating to use here is
dsinθ = mλ
so, sinθ = mλ/d
The spacing gets wider for greater values of sinθ.
Therefore, for sinθ to increase, wavelength would have to increase or spacing decrease
Answer A works, increase the wavelength
Answer B fails, when you immerse in water, the velocity of the waves decreases, and thus the wavelength
Answer C fails, its the opposite
Therefore you can see that D and E fail as well
The only answer is A
Add Answer to:
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