Of the two primary components of the interstellar medium, dust and gas, the interstellar gas does not obscure background light passing through to any great extent. Rather, the dark patches in the interstellar medium are caused by the effects of dust grains.

Rank the dust grain sizes in the following hypothetical regions (A, B, and C) using the longest wavelength of light that each obscures as a measure of the grain size.

Region A obscures all wavelengths of light shorter than ultraviolet light.

Region B obscures all wavelengths of light shorter than visible light.

Region C obscures all wavelengths of light shorter than infrared light.

Rank from left to right the largest grains to smallest grains. To rank items as equivalent, overlap them.

Question

Physics

Pranav Norton

16 March, 17:25

Of the two primary components of the interstellar medium, dust and gas, the interstellar gas does not obscure background light passing through to any great extent. Rather, the dark patches in the interstellar medium are caused by the effects of dust grains.

Rank the dust grain sizes in the following hypothetical regions (A, B, and C) using the longest wavelength of light that each obscures as a measure of the grain size.

Region A obscures all wavelengths of light shorter than ultraviolet light.

Region B obscures all wavelengths of light shorter than visible light.

Region C obscures all wavelengths of light shorter than infrared light.

Rank from left to right the largest grains to smallest grains. To rank items as equivalent, overlap them.

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Answers (1)

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Raelynn Santana · Answer 1

C> B> A

Explanation:

Order of increasing wavelength

ultraviolet< visible < infrared

The wavelength being blocked depends on the size of the dust grain. Larger the grain, larger wavelength it be able to block.

Region A obscures wavelengths of light shorter than ultraviolet. Region B obscures wavelengths of light shorter than visible light and Region C obscures wavelengths of light shorter than infrared light. Region C must have largest grains as it is able to block longer wavelengths. Thus, the rank of dust grains based on their size is C > B > A