The figures below represent interference fringes. The distances from the screen to the slits is the same for each figure, and the planes of the screen and the slits are parallel. In each figure the spacing *d* between the slits is the same. Which figure(s) represent(s) slits illuminated with light of the shortest wavelength ? The white spaces represent the interference maxima.

a.

I.

b.

II.

c.

III.

d.

IV.

e.

V.

[Ques. 2]

The figures below represent interference fringes. The distances from the screen to the slits is the same for each figure, and the planes of the screen and the slits are parallel. In each figure the spacing *d* between the slits is the same. Which figure(s) represent(s) slits illuminated with light of the greatest wavelength ? The white spaces represent the interference maxima.

a.

I.

b.

II.

c.

III.

d.

IV.

e.

V.

[Ques. 3]

The figures below represent interference fringes. The distances from the screen to the slits is the same for each figure, and the planes of the screen and the slits are parallel. Which figure(s) represent(s) slits with the greatest spacing *d* between the slits? The white spaces represent the interference maxima.

a.

I.

b.

II.

c.

III.

d.

IV.

e.

V.

[Ques. 4]

The figures below represent interference fringes. The distances from the screen to the slits is the same for each figure, and the planes of the screen and the slits are parallel. Which figure(s) represent(s) slits with the smallest spacing *d* between the slits? The white spaces represent the interference maxima.

a.

I.

b.

II.

c.

III.

d.

IV.

e.

V.

[Ques. 5] Ray says that interference effects cannot be observed with visible light because random phase changes occur in time intervals less than a nanosecond. Stacy says that doesn't matter if collimated light from a single source reaches multiple openings. (They are arguing about a light source 50.0 cm away from two 0.0100-mm-wide slits, 2.00 mm apart, with a screen 1.00 m away from the slits.) Which one, if either, is correct, and why?

a.

Ray, because the phases at the two slits will be random and different.

b.

Ray, because it takes light over 3 ns to travel 1.00 m to the screen.

c.

Stacy, because the difference in time of travel from the source to the slits is no more than about 7 10

^{12}s.

d.

Stacy, but only if a lens is placed in front of the slits.

e.

Both, because interference of light never occurs outside a physics lab.

[Ques. 6] A planar cross section through two spherical waves emanating from the sources S

_{1}and S

_{2}in the plane is shown in the figure. The black circles are one and two wavelengths from their respective sources. The lighter circles are one-half and one-and-a-half wavelengths distant from their respective sources. If the phase at S

_{1}and S

_{2}is zero at this instant, and the waves shown arriving at P

_{2}both arrive with amplitude A, the difference in phase angle at point P

_{2}(in radians) is

a.

0.

b.

/2.

c.

.

d.

3/2.

e.

2.

[Ques. 7]

A planar cross section through two spherical waves emanating from the sources S_{1} and S_{2} in the plane is shown in the figure. The black circles are one and two wavelengths from their respective sources. The lighter circles are one half and one and a half wavelengths distant from their respective sources. If the phase at S_{1} and S_{2} is zero at this instant, and the waves shown arriving at P_{1} both arrive with amplitude A, the magnitude of the phase angle of each wave at point P_{1} (in radians) is

a.

0.

b.

.

c.

2.

d.

3.

e.

/2.

[Ques. 8]

A planar cross section through two spherical waves emanating from the sources S_{1} and S_{2} in the plane is shown in the figure. S_{1} and S_{2} are in phase. The black circles are one and two wavelengths from their respective sources. The lighter circles are one half and one and a half wavelengths distant from their respective sources. If the waves shown arriving at P_{2} both arrive with amplitude A, the resultant amplitude at point P_{2} is

a.

0.

b.

.

c.

*A*.

d.

.

e.

2

*A*.

[Ques. 9] A planar cross section through two spherical waves emanating from the sources S

_{1}and S

_{2}in the plane is shown in the figure. S

_{1}and S

_{2}are in phase. The black circles are one and two wavelengths from their respective sources. The lighter circles are one-half and one-and-a-half wavelengths distant from their respective sources. If the waves shown arriving at P

_{1}both arrive with amplitude A, the resultant amplitude at point P

_{1}is

a.

0.

b.

.

c.

*A*.

d.

.

e.

2

*A*.

[Ques. 10]

The figure shows two point sources of light, A and B. B emits light waves that are + radians out of phase with the waves from A. A is 3 from P. B is 5 from P. ( is the wavelength.) The phase difference between waves arriving at P from A and B is

a.

0 rad.

b.

rad.

c.

2 rad.

d.

3 rad.

e.

4 rad.