Help please with qusetion 1 and 2? Multiple choise, a,b or c 1. A double-slit sl

Question

Help please with qusetion 1 and 2? Multiple choise, a,b or c

1. A double-slit slide is used with a coherent, monochromatic light source of wavelength 1 to produce an interference pattern on a distant screen. The light source is now replaced with a coherent, monochromatic light source of wavelength 2. 2 > 1. Which one of the following statements is correct concerning the interference patterns produced by the slide?

a)The maxima for the longer wavelength are further apart than in the pattern produced by the shorter wavelength.

b)The patterns are identical.     

c)The maxima for the longer wavelength are closer together than in the pattern produced by the shorter wavelength.

2. Waves are incident on a barrier with an opening in it. Which one of the following statements concerning the dependence of diffraction on the size of the opening is correct?

a) The amount of spreading (diffraction) of the waves passing through the opening increases as the size of the opening decreases.

b) The amount of spreading (diffraction) of the waves passing through the opening does not depend on the size of the opening.     

c) The amount of spreading (diffraction) of the waves passing through the opening increases as the size of the opening increases.

Explanation / Answer

1) a) The maxima for the longer wavelength are further apart than in the pattern produced by the shorter wavelength.

2) a) The amount of spreading (diffraction) of the waves passing through the opening increases as the size of the opening decreases.

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