In Figure 38.4, assume the slit is in a barrier that is opaque to x-rays as well as to visible light. The photograph in Figure 38.4b shows the diffraction pattern produced with visible light. What will happen if the experiment is repeated with x-rays as the incoming wave and with no other changes? (a) The diffraction pattern is similar. (b) There is no noticeable diffraction pattern but rather a projected shadow of high intensity on the screen, having the same width as the slit. (c) The central maximum is much wider, and the minima occur at larger angles than with visible light. (d) No x-rays reach the screen.
In Figure 38.4, assume the slit is in a barrier that is opaque to x-rays as well as to visible light. The photograph in Figure 38.4b shows the diffraction pattern produced with visible light. What will happen if the experiment is repeated with x-rays as the incoming wave and with no other changes? (a) The diffraction pattern is similar. (b) There is no noticeable diffraction pattern but rather a projected shadow of high intensity on the screen, having the same width as the slit. (c) The central maximum is much wider, and the minima occur at larger angles than with visible light. (d) No x-rays reach the screen.
Solution Summary: The author explains that the diftion pattern cannot be similar as there is a large difference of wavelength between the visible light and x-rays.
In Figure 38.4, assume the slit is in a barrier that is opaque to x-rays as well as to visible light. The photograph in Figure 38.4b shows the diffraction pattern produced with visible light. What will happen if the experiment is repeated with x-rays as the incoming wave and with no other changes? (a) The diffraction pattern is similar. (b) There is no noticeable diffraction pattern but rather a projected shadow of high intensity on the screen, having the same width as the slit. (c) The central maximum is much wider, and the minima occur at larger angles than with visible light. (d) No x-rays reach the screen.
Although we have discussed single-slit diffraction only
for a slit, a similar result holds when light bends around
a straight, thin object, such as a strand of hair. In that
case, a is the width of the strand. From actual lab
measurements on a human hair, it was found that
when a beam of light of wavelength 632.8nm was
shone on a single strand of hair, and the diffracted
light was viewed on a screen 1.25m away, the first dark
fringes on either side of the central bright spot were
5.22cm apart. How thick was this strand of hair?
When an x-ray beam is scattered off the planes of a
crystal, the scattered beam creates an interference
pattern. This phenomenon is called Bragg scattering. For
an observer to measure an interference maximum, two
conditions have to be satisfied:
1. The angle of incidence has to be equal to
the angle of reflection.
2. The difference in the beam's path from a
source to an observer for neighboring
planes has to be equal to an integer
multiple of the wavelength; that is,
2d sin(0) = mx for m = 1, 2, ....
The path difference 2d sin(0) can be determined from
the diagram (Figure 1). The second condition is known as
the Bragg condition.
Figure
1 of 1
d sine
d sine
Review
nstants
Part A
An x-ray beam with wavelength 0.260 nm is directed at a crystal. As the angle of incidence increases, you observe
the first strong interference maximum at an angle 20.5 °. What is the spacing d between the planes of the crystal?
Express your answer in nanometers to four significant figures.
VE ΑΣΦ
?
d =
nm…
A blackbody radiator in the shape of a sphere has a surface area of 152 If it has a temperature of 1200 K how much energy does it emit per second?
If the sun emits light with a peak wavelength of 500 nm. What is the temperature of the sun?
Two slits, 0.5 mm apart, are placed at a distance of 1.5 meters from a screen. Light of 300 nm illuminates the two slits and an interference pattern is observed on the screen. What is the distance between the central bright spot and the first bright spot on either side?
Chapter 38 Solutions
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Diffraction of light animation best to understand class 12 physics; Author: PTAS: Physics Tomorrow Ambition School;https://www.youtube.com/watch?v=aYkd_xSvaxE;License: Standard YouTube License, CC-BY