Question 1

The largest x-ray wavelength that can be diffracted by crystal planes with a separation of 0.316 nm is:

Accepted Answer

A)   0.158 nm
B)   0.316 nm
C)   0.474 nm
D)   0.632 nm
E)   1.26 nmF) D) and E)
G) A) and E)

Question 2

In a single-slit diffraction pattern, the central maximum is about twice as wide as the other maxima. This is because:

Accepted Answer

A)   half the light is diffracted up and half is diffracted down
B)   the central maximum has both electric and magnetic fields present
C)   the small angle approximation applies only near the central maximum
D)   the screen is flat instead of spherical
E)   none of the aboveF) A) and C)
G) A) and E)

Question 3

Radio waves are readily diffracted around buildings whereas light waves are negligibly diffracted around buildings. This is because radio waves:

Accepted Answer

A)   are plane polarized
B)   have much longer wavelengths than light waves
C)   have much shorter wavelengths than light waves
D)   are nearly monochromatic (single frequency) 
E)   are amplitude modulated (AM) F) All of the above
G) C) and E)

Question 4

600-nm light is incident on a defraction grating with a ruling separation of 1.7*10-6 m. The second order line occurs at a diffraction angle of:

Accepted Answer

A)   0
B)   10   °\degree° 
C)   21   °\degree° 
D)   42   °\degree° 
E)   45   °\degree°F) All of the above
G) B) and C) E

Question 5

At a diffraction line phasors associated with waves from the slits of a multiple-slit barrier:

Accepted Answer

A)   are aligned
B)   form a closed polygon
C)   form a polygon with several sides missing
D)   are parallel but adjacent phasors point in opposite directions
E)   form the arc of a circleF) None of the above
G) C) and E) A

Question 6

Sound differs from light in that sound:

Accepted Answer

A)   is not subject to diffraction
B)   is a torsional wave rather than a longitudinal wave
C)   does not require energy for its origin
D)   is a longitudinal wave rather than a transverse wave
E)   is always monochromaticF) B) and C)
G) C) and D)

Question 7

A diffraction-limited laser of length  and aperture diameter d generates light of wavelength  λ\lambdaλ . If the beam is directed at the surface of the Moon a distance D away, the radius of the illuminated area on the moon is approximately:

Accepted Answer

A)   
B)   dD/ λ\lambdaλ 
C)   
D)   D λ\lambdaλ /d
E)    F) A) and B)
G) C) and D)

Question 8

A student wishes to produce a single-slit diffraction pattern in a ripple tank experiment. He considers the following parameters:  Which two of the above should be decreased to produce more bending?

Accepted Answer

A)   I, III
B)   I, IV
C)   II, III
D)   II, IV
E)   III, IVF) B) and E)
G) A) and B)

Question 9

Bragg's law for x-ray diffraction is 2d sin θ	hetaθ  = m λ\lambdaλ , where  θ	hetaθ  is the angle between the incident beam and:

Accepted Answer

A)   a reflecting plane of atoms
B)   the normal to a reflecting plane of atoms
C)   the scattered beam
D)   the normal to the scattered beam
E)   the refracted beam F) C) and D)
G) None of the above

Question 10

A beam of x-rays of wavelength 0.20 nm is diffracted by a set of planes in a crystal whose separation is 3.1* 10-8 cm. The smallest angle between the beam and the crystal planes for which a reflection occurs is:

Accepted Answer

A)   0.70 rad
B)   0.33 rad
C)   0.033 rad
D)   0.066 rad
E)   no such angle existsF) A) and E)
G) A) and D)

Question 11

Two nearly equal wavelengths of light are incident on an N slit grating. The two wavelengths are not resolvable. When N is increased they become resolvable. This is because:

Accepted Answer

A)   more light gets through the grating
B)   the lines get more intense
C)   the entire pattern spreads out
D)   there are more orders present
E)   the lines become more narrowF) A) and E)
G) D) and E) E

Question 12

X rays are:

Accepted Answer

A)   electromagnetic waves
B)   negatively charged ions
C)   rapidly moving electrons
D)   rapidly moving protons
E)   rapidly moving neutronsF) C) and D)
G) B) and D)

Question 13

A diffraction grating just resolves the wavelengths 400.0 nm and 400.1 nm in first order. The number of slits in the grating is:

Accepted Answer

A)   400
B)   1000
C)   2500
D)   4000
E)   not enough information is givenF) B) and E)
G) A) and E)

Question 14

As more slits with the same spacing are added to a multiple-slit system the lines:

Accepted Answer

A)   spread further apart
B)   move closer together
C)   become wider
D)   becomes narrower
E)   do not change in position or widthF) A) and B)
G) A) and C)

Question 15

Figure (i)  shows a double-slit pattern obtained using monochromatic light. Consider the following five possible changes in conditions:  Which of the above would change Figure (i)  into Figure (ii) ?

Accepted Answer

A)   3 only
B)   5 only
C)   1 and 3 only
D)   1 and 5 only
E)   2 and 4 onlyF) B) and C)
G) B) and E)

Question 16

In the equation sin θ	hetaθ  =  λ\lambdaλ /a for single-slit diffraction,  θ	hetaθ  is:

Accepted Answer

A)   the angle to the first minimum
B)   the angle to the second maximum
C)   the phase angle between the extreme rays
D)   N π\piπ  where N is an integer
E)   (N + 1/2)  π\piπ  where N is an integer F) D) and E)
G) C) and D)

Question 17

What is the minimum number of slits required in a deffraction grating to just resolve light with wavelengths of 471.0 nm and 471.6 nm?

Accepted Answer

A)   99
B)   197
C)   393
D)   786
E)   1179F) B) and C)
G) B) and E)

Question 18

In order to obtain a good single-slit diffraction pattern, the slit width could be:

Accepted Answer

A)    λ\lambdaλ 
B)    λ\lambdaλ /10
C)   10 λ\lambdaλ 
D)   104 λ\lambdaλ 
E)    λ\lambdaλ /104 F) B) and C)
G) C) and D)

Question 19

A diffraction grating of width W produces a deviation  θ	hetaθ  in second order for light of wavelength  λ\lambdaλ . The total number N of slits in the grating is given by:

Accepted Answer

A)   2W λ\lambdaλ /sin θ	hetaθ  
B)   (W/ λ\lambdaλ ) sin θ	hetaθ  
C)    λ\lambdaλ W/2sin θ	hetaθ  
D)   (W/2 λ\lambdaλ ) sin θ	hetaθ  
E)   2 λ\lambdaλ /sin θ	hetaθ   F) D) and E)
G) C) and D)

Question 20

In the equation d sin θ	hetaθ = m λ\lambdaλ  for the lines of a diffratction grating m is:

Accepted Answer

A)   the number of slits
B)   the slit width
C)   the slit separation
D)   the order of the line
E)   the index of refraction F) D) and E)
G) A) and B)

Exam 36: Diffraction

The largest x-ray wavelength that can be diffracted by crystal planes with a separation of 0.316 nm is:

Correct Answer
verified

In a single-slit diffraction pattern, the central maximum is about twice as wide as the other maxima. This is because:

Correct Answer
verified

Radio waves are readily diffracted around buildings whereas light waves are negligibly diffracted around buildings. This is because radio waves:

Correct Answer
verified

600-nm light is incident on a defraction grating with a ruling separation of 1.7*10^-⁶ m. The second order line occurs at a diffraction angle of:

Correct Answer
verified
E

At a diffraction line phasors associated with waves from the slits of a multiple-slit barrier:

Correct Answer
verified
A

Sound differs from light in that sound:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Bragg's law for x-ray diffraction is 2d sin $\theta$ = m $\lambda$ , where $\theta$ is the angle between the incident beam and:

Correct Answer
verified

A beam of x-rays of wavelength 0.20 nm is diffracted by a set of planes in a crystal whose separation is 3.1* 10^-⁸ cm. The smallest angle between the beam and the crystal planes for which a reflection occurs is:

Correct Answer
verified

Two nearly equal wavelengths of light are incident on an N slit grating. The two wavelengths are not resolvable. When N is increased they become resolvable. This is because:

Correct Answer
verified
E

X rays are:

Correct Answer
verified

A diffraction grating just resolves the wavelengths 400.0 nm and 400.1 nm in first order. The number of slits in the grating is:

Correct Answer
verified

As more slits with the same spacing are added to a multiple-slit system the lines:

Correct Answer
verified

Figure (i) shows a double-slit pattern obtained using monochromatic light. Consider the following five possible changes in conditions: Which of the above would change Figure (i) into Figure (ii) ?

Correct Answer
verified

In the equation sin $\theta$ = $\lambda$ /a for single-slit diffraction, $\theta$ is:

Correct Answer
verified

What is the minimum number of slits required in a deffraction grating to just resolve light with wavelengths of 471.0 nm and 471.6 nm?

Correct Answer
verified

In order to obtain a good single-slit diffraction pattern, the slit width could be:

Correct Answer
verified

A diffraction grating of width W produces a deviation $\theta$ in second order for light of wavelength $\lambda$ . The total number N of slits in the grating is given by:

Correct Answer
verified

In the equation d sin $\theta$ = m $\lambda$ for the lines of a diffratction grating m is:

Correct Answer
verified

Exam 36: Diffraction

The largest x-ray wavelength that can be diffracted by crystal planes with a separation of 0.316 nm is:

Correct AnswerverifiedShow Answer

In a single-slit diffraction pattern, the central maximum is about twice as wide as the other maxima. This is because:

Correct AnswerverifiedShow Answer

Radio waves are readily diffracted around buildings whereas light waves are negligibly diffracted around buildings. This is because radio waves:

Correct AnswerverifiedShow Answer

600-nm light is incident on a defraction grating with a ruling separation of 1.7*10-6 m. The second order line occurs at a diffraction angle of:

Correct AnswerverifiedE

At a diffraction line phasors associated with waves from the slits of a multiple-slit barrier:

Correct AnswerverifiedA

Sound differs from light in that sound:

Correct AnswerverifiedShow Answer

A diffraction-limited laser of length and aperture diameter d generates light of wavelength λ\lambdaλ . If the beam is directed at the surface of the Moon a distance D away, the radius of the illuminated area on the moon is approximately:

Correct AnswerverifiedShow Answer

A student wishes to produce a single-slit diffraction pattern in a ripple tank experiment. He considers the following parameters: Which two of the above should be decreased to produce more bending?

Correct AnswerverifiedShow Answer

Bragg's law for x-ray diffraction is 2d sin θ\thetaθ = m λ\lambdaλ , where θ\thetaθ is the angle between the incident beam and:

Correct AnswerverifiedShow Answer

A beam of x-rays of wavelength 0.20 nm is diffracted by a set of planes in a crystal whose separation is 3.1* 10-8 cm. The smallest angle between the beam and the crystal planes for which a reflection occurs is:

Correct AnswerverifiedShow Answer

Two nearly equal wavelengths of light are incident on an N slit grating. The two wavelengths are not resolvable. When N is increased they become resolvable. This is because:

Correct AnswerverifiedE

X rays are:

Correct AnswerverifiedShow Answer

A diffraction grating just resolves the wavelengths 400.0 nm and 400.1 nm in first order. The number of slits in the grating is:

Correct AnswerverifiedShow Answer

As more slits with the same spacing are added to a multiple-slit system the lines:

Correct AnswerverifiedShow Answer

Figure (i) shows a double-slit pattern obtained using monochromatic light. Consider the following five possible changes in conditions: Which of the above would change Figure (i) into Figure (ii) ?

Correct AnswerverifiedShow Answer

In the equation sin θ\thetaθ = λ\lambdaλ /a for single-slit diffraction, θ\thetaθ is:

Correct AnswerverifiedShow Answer

What is the minimum number of slits required in a deffraction grating to just resolve light with wavelengths of 471.0 nm and 471.6 nm?

Correct AnswerverifiedShow Answer

In order to obtain a good single-slit diffraction pattern, the slit width could be:

Correct AnswerverifiedShow Answer

A diffraction grating of width W produces a deviation θ\thetaθ in second order for light of wavelength λ\lambdaλ . The total number N of slits in the grating is given by:

Correct AnswerverifiedShow Answer

In the equation d sin θ\thetaθ = m λ\lambdaλ for the lines of a diffratction grating m is:

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

600-nm light is incident on a defraction grating with a ruling separation of 1.7*10^-⁶ m. The second order line occurs at a diffraction angle of:

Correct Answer
verified
E

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Bragg's law for x-ray diffraction is 2d sin $\theta$ = m $\lambda$ , where $\theta$ is the angle between the incident beam and:

Correct Answer
verified

A beam of x-rays of wavelength 0.20 nm is diffracted by a set of planes in a crystal whose separation is 3.1* 10^-⁸ cm. The smallest angle between the beam and the crystal planes for which a reflection occurs is:

Correct Answer
verified

Correct Answer
verified
E

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In the equation sin $\theta$ = $\lambda$ /a for single-slit diffraction, $\theta$ is:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A diffraction grating of width W produces a deviation $\theta$ in second order for light of wavelength $\lambda$ . The total number N of slits in the grating is given by:

Correct Answer
verified

In the equation d sin $\theta$ = m $\lambda$ for the lines of a diffratction grating m is:

Correct Answer
verified