Question

Yellow light is used in a single slit diffraction experiment
with slit width of 0.6 mm. If yellow light is replaced by
X-rays, then the observed pattern will reveal

• A. that the central maximum is narrower
• B. more number of fringes
• C. less number of fringes
• D. no diffraction pattern

Answer 1

Answer: (D)

Diffraction is obtained when the slit width is of the order of
wavelength of light (or any electromagnetic wave) used.
Here, wavelength of X-rays (1-100 A) << slit width
(0.6 mm). Therefore, no diffraction pattern will be observed.