Light of wavelength passes through a single slit of width a. The diffraction pattern is observed on a screen a distance x from the slit.

Q36.1

1. double the slit width a and double the wavelength

2. double the slit width a and halve the wavelength

3. halve the slit width a and double the wavelength

4. halve the slit width a and halve the wavelength

Which of the following will give the greatest increase in the angular width of the central diffraction maximum?

Light of wavelength passes through a single slit of width a. The diffraction pattern is observed on a screen a distance x from the slit.

A36.1

1. double the slit width a and double the wavelength

2. double the slit width a and halve the wavelength

3. halve the slit width a and double the wavelength

4. halve the slit width a and halve the wavelength

Which of the following will give the greatest increase in the angular width of the central diffraction maximum?

In a single-slit diffraction experiment with waves of wavelength , there will be no intensity minima (that is, no dark fringes) if the slit width is small enough.

What is the maximum slit width a for which this occurs?

Q36.2

1. a =

2. a =

3. a = 2

4. answer depends on the distance from the slit to the screen on which the diffraction pattern is viewed

In a single-slit diffraction experiment with waves of wavelength , there will be no intensity minima (that is, no dark fringes) if the slit width is small enough.

What is the maximum slit width a for which this occurs?

A36.2

1. a =

2. a =

3. a = 2

4. answer depends on the distance from the slit to the screen on which the diffraction pattern is viewed

In Young’s experiment, coherent light passing through two slits separated by a distance d produces a pattern of dark and bright areas on a distant screen.

If instead you use 10 slits, each the same distance d from its neighbor, how does the pattern change?

Q36.3

1. the bright areas move farther apart

2. the bright areas move closer together

3. the spacing between bright areas remains the same, but the bright areas become narrower

4. the spacing between bright areas remains the same, but the bright areas become broader

In Young’s experiment, coherent light passing through two slits separated by a distance d produces a pattern of dark and bright areas on a distant screen.

If instead you use 10 slits, each the same distance d from its neighbor, how does the pattern change?

A36.3

1. the bright areas move farther apart

2. the bright areas move closer together

3. the spacing between bright areas remains the same, but the bright areas become narrower

4. the spacing between bright areas remains the same, but the bright areas become broader

In an x-ray diffraction experiment using a crystal, a pattern of bright spots is formed by

Q36.4

1. interference of x-rays scattered by different atoms in the crystal

2. interference of x-rays emitted by different atoms in the crystal

3. interference of x-rays scattered by different parts of an individual atom in the crystal

4. interference of x-rays emitted by different parts of an individual atom in the crystal

In an x-ray diffraction experiment using a crystal, a pattern of bright spots is formed by

A36.4

1. interference of x-rays scattered by different atoms in the crystal

2. interference of x-rays emitted by different atoms in the crystal

3. interference of x-rays scattered by different parts of an individual atom in the crystal

4. interference of x-rays emitted by different parts of an individual atom in the crystal

You use a telescope lens to form an image of two closely-spaced, distant stars. Which of the following will increase the resolving power?

Q36.5

1. use a filter so that only the blue light from the stars enters the lens

2. use a filter so that only the red light from the stars enters the lens

3. use a lens of smaller diameter

4. more than one of the above

You use a telescope lens to form an image of two closely-spaced, distant stars. Which of the following will increase the resolving power?

A36.5

1. use a filter so that only the blue light from the stars enters the lens

2. use a filter so that only the red light from the stars enters the lens

3. use a lens of smaller diameter

4. more than one of the above