What is the cosmic horizon?

A. the distance beyond which astronomical objects are invisible because their light has not yet reached us
B. the diameter of the Universe
C. the average distance between galaxies
D. the place where the Big Bang occurred


Answer: A

Physics & Space Science

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Which of the following stars is the hottest?

A) M7 B) A0 C) G6 D) B4

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In a Young's double-slit interference apparatus, the distance from the slits to the screen is doubled. The distance between adjacent light and dark fringes changes by a factor of:

a. 1/4. b. 1/2. c. 1. d. 2. e. 4.

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A quantity of ideal gas in a rigid container has a pressure of 1.00 × 10^6 Pa at 0°C. If the pressure is increased to 1.75 × 10^6 Pa, what is the temperature of the gas after this is done?

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A Young's double slit has a slit separation of 2.50 × 10^-5 m on which a monochromatic light beam is directed. The resultant bright fringes on a screen 1.00 m from the double slit are separated by 2.30 × 10^-2 m. What is the wavelength of this beam? (1 nm = 10-9 m)

a. 575 nm c. 373 nm b. 454 nm d. 667 nm

Physics & Space Science