A Telescope That Uses a Mirror 249 Cm in Diameter

question 26

Multiple Choice

A telescope that uses a mirror 249 cm in diameter is just able to resolve a double-star system that is 1.5 light-years away. Assume the light from the stars has a wavelength of 691 nm. How far apart are the two stars? One light year = 9.46 × 10¹⁵ m. (Use the approximation for θ_min: θ_min ≈ .)

• A)9.8 × 10⁷ m
• B)8.5 × 10⁸ m
• C)8.5 × 10⁹ m
• D)9.8 × 10⁸ m
• E)4.8 × 10⁹ m

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Definitions:

Cue-dependent

Relating to the phenomenon where recall of information is enhanced if retrieval occurs in a context similar to the one where the information was encoded.

Childhood Amnesia

The inability to remember events and experiences that occurred during the first 2 or 3 years of life.

Psychogenic Amnesia

A type of amnesia caused by psychological stress or trauma, characterized by temporary memory loss that cannot be attributed to a neurological condition.

Dissociative Amnesia

A psychological condition characterized by a temporary loss of memory due to a traumatic event or stress, where the individual cannot recall personal information.