Two Flat Glass Plates Are in Contact Along One End

question 87

Multiple Choice

Two flat glass plates are in contact along one end and are separated by a sheet of tissue paper at the other end.A monochromatic source of wavelength 490 nm illuminates the top plate.If 21 dark bands are counted across the top plate,what is the paper thickness? (1 nm = 10^-9 m)

• A)2.7 x 10^-6 m
• B)3.4 x 10^-6 m
• C)4.9 x 10^-6 m
• D)5.8 x 10^-6 m

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Definitions:

Process Evaluation

This refers to the systematic collection of information about a program or project to understand how it is operating and to assess whether it is achieving its goals.

Impact Evaluation

Impact evaluation assesses the changes that can be attributed to a particular intervention, including what outcomes would have happened in the absence of the intervention. It focuses on the causality between actions and outcomes.

Process Evaluation

Analysis of the components and the implementation of a program, aimed at understanding how it operates and its effectiveness.

Outcome Evaluation

Assessment focused on the actual impacts or outcomes resulting from the implementation of a program or activity.