Ch 17: Wave Optics

The frequency of a light wave in air is 5.3×1014Hz. Is the frequency of this wave higher, lower, or the same after the light enters a piece of glass?

The same.

(Figure 1) shows the viewing screen in a double-slit experiment with monochromatic light. Fringe C is the central maximum. The fringe separation is Δy. What will happen to the fringe spacing if the wavelength of the light is decreased?

A - Δy will decrease.

B - Δy will increase.

C - Δy will not change.

Δy will decrease.

(Figure 1) shows the viewing screen in a double-slit experiment with monochromatic light. Fringe C is the central maximum. The fringe separation is Δy. What will happen to the fringe spacing if the spacing between the slits is decreased?

A - Δy will decrease.

B - Δy will increase.

C - Δy will not change.

Δy will increase.

(Figure 1) shows the viewing screen in a double-slit experiment with monochromatic light. Fringe C is the central maximum. The fringe separation is Δy. What will happen to the fringe spacing if the distance to the screen is decreased?

A - Δy will decrease.

B - Δy will increase.

C - Δy will not change.

Δy will decrease.

The figure is the interference pattern seen on a viewing screen behind 2 slits. Suppose the 2 slits were replaced by 20 slits having the same spacing d between adjacent slits.(Figure 1) Would the number of fringes on the screen increase, decrease, or stay the same?

Stay the same.

The figure is the interference pattern seen on a viewing screen behind 2 slits. Suppose the 2 slits were replaced by 20 slits having the same spacing d between adjacent slits.(Figure 1) Would the fringe spacing increase, decrease, or stay the same?

Stay the same.

The figure is the interference pattern seen on a viewing screen behind 2 slits. Suppose the 2 slits were replaced by 20 slits having the same spacing d between adjacent slits.(Figure 1) Would the width of each fringe increase, decrease, or stay the same?

Decrease.

The figure is the interference pattern seen on a viewing screen behind 2 slits. Suppose the 2 slits were replaced by 20 slits having the same spacing d between adjacent slits.(Figure 1) Would the brightness of each fringe increase, decrease, or stay the same?

Increase.

How do you get m to nm?

Multiply by 1 × 10^9.

How do you get mm to m?

Multiply by 0.001.

A double-slit experiment is immersed in water (with an index of refraction of 1.33). When in the water, what happens to the interference fringes?

A. They are more closely spaced than in air by a factor of 1.33.

B. They are more widely spaced than in air by a factor of 1.33.

C. They are spaced the same as in air.

D. They are shifted upward.

E. They are shifted downward.

They are more closely spaced than in air by a factor of 1.33.