What, Approximately, Are the Dimensions of the Smallest Object on Earth

question 39

Multiple Choice

What, approximately, are the dimensions of the smallest object on Earth that the astronauts can resolve by eye at 200 km height from the space shuttle? Assume λ = 500 nm light and a pupil diameter D = 0.50 cm. Assume eye fluid has an average n = 1.33.

• A) 150 m
• B) 100 m
• C) 250 m
• D) 25 m
• E) 18 m

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Definitions:

Median

The middle value in a data set, which separates the higher half from the lower half.

Range

In statistics, range is the difference between the largest and smallest values in a dataset.

Variance

A measure of the dispersion of a set of data points around their mean value, indicating how spread out the data are.

Deviations

Differences between observed values and some reference value, often the mean of the dataset.