9.4 Review #2

Choose the INCORRECT options resolving Power R (or Resolvance) of a diffraction grating?

• ability to resolve 2 specific and close wavelengths

• ability to resolve a tiny range of wavelengths

• ability to resolve any range of wavelengths

• Ability to resolve two specific light sources

Choose the INCORRECT option describing the Resolvance R.

• Units of Resolving Power is Watts

• No units in Resolving Power

• λ_avg is from 2 specific wavelengths

• λ_avg is from a range of wavelengths

Choose the INCORRECT option describing the Δλ.

• λ_final – λ_initial

• Range of beam of light

• λ₁ – λ₂

• Range of wavelengths within two specific λs

Choose the INCORRECT description of the λ_green on the right side of 0 cm :

• λ_green can be seen clearly 3 times on the right side of 0 cm

• λ_green can be clearly seen for m = 1, 2, and 3

• λ_green has three times with maxima

• λ_green has three times with minima

Choose the INCORRECT description of the Resolvance Power equation:

• m is the order at which line (λ) is seen.

• N total number of rulings or lines in a diffraction grating.

• N units are in rulings or lines

• N units are in rulings/mm or lines/mm

Choose the CORRECT description of the diffraction grating with 20 mm wide

• N = 500 lines/mm

• N = 1,000 rulings/mm

• N = 1,000 rulings

Choose the INCORRECT description if you solve or rearrange for Δλ

• Smaller the Δλ ... highest resolving power.

• The smallest difference in wavelengths that can be resolved.

• Smallest Δλ to resolve using a high number of rulings.

• Smaller the Δλ ... least resolving power.

Choose the INCORRECT description for Resolvance

• Smaller the Δλ ... higher resolving power.

• higher the order to see a specific λ ... higher resolving power

• smaller the order to see a specific λ ... higher resolving power

• smaller the total number of ruling ... smaller resolving power

Choose the INCORRECT information to be used if we want to resolve 2 lights (620nm and 630nm) from a distant galaxy.

• Δλ = | 620nm – 630nm |

• Δλ = 630nm – 620nm

• λ = 630nm

• λ = 625nm

Choose the INCORRECT information to be used if we want to resolve 2 lights (568.0nm and 569.0nm) from a distant galaxy.

• Δλ = | 568.0nm – 569.0nm |

• Δλ = 569.0nm – 568.0nm

• λ = 569nm

• λ = 568.5nm