Question

1. The path length difference for the waves exiting the two slits of the double slit experiment must be equal to _____ for a bright fringe to appear.

one wavelength

one-half wavelength

an integer number of wavelengths

None of the above

2. When white light is used in the double slit experiment, the first order and higher bright fringes appear _____.

white

as a rainbow

red

None of the above

3. The fringes of a diffraction grating are narrower and sharper than the fringes of the double slit experiment.

True

False

4. It is more useful to know the _____ for a diffraction grating.

line density

spacing between the lines

number of lines

None of the above

5. The smaller the spacing between the lines of a diffraction grating, the _____ the fringes.

broader

fainter

narrower

None of the above

6. The smaller the spacing between the lines of a diffraction grating, the _____ the fringes.

more spread out

more compact

greater the number of

None of the above

Answer 1

1. answer: an integer number of wavelengths

The path length difference for the waves exiting the two slits of the double slit experiment must be equal to an integer number of wavelengths for a bright fringe to appear.

2. Answer: as a rainbow

When white light is used in the double slit experiment, the first order and higher bright fringes appear as a rainbow

3. Answer: True.

The fringes of a diffraction grating are narrower and sharper than the fringes of the double slit experiment.

4.Answer: line density

It is more useful to know the line density for a diffraction grating.

5.Answer: narrower.

The smaller the spacing between the lines of a diffraction grating, the narrower the fringes.

6.Answer: greater the number of

The smaller the spacing between the lines of a diffraction grating, the greater the number of the fringes.

Thnak You.