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AST1002- SampleTest1

AST1002- SampleTest1 - Sample Test 1 Instructions Each...

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Sample Test 1 Instructions Each multiple choice question has one correct answer. Choose the most correct answer. Bring a calculator to the exam. Useful information 1 hour = 3600 sec. 1 year = 3.16 x 10 7 sec. c = 3x10 8 m/sec = 3x10 5 km/sec n – nano = 10 -9 , μ - micro = 10 -6 , m – mili = 10 -3 , k – kilo = 10 3 , M – mega = 10 6 1 AU = 1.53x10 11 m = 1.53x10 8 km, 1 ly = 9.5x10 15 m = 9.5x10 12 km, K = o C + 273 P P 2 = A 3 , F = GmM/r 2 , F = ma, G = 6.67x10 -11 Nm 2 /kg 2 d = vt, E = hf = hc/ λ , f λ = c, v r = Δλ / λ α (arc sec) = 11.6/D(in cm), α (arc sec) = 0.02 λ (nm)/D(in cm), M = f o /f e Circumference = 2 π r, Area(circle) = π r 2 , Area(sphere) = (4/3) π r 2 Volume(sphere) = (4/3) π r 3 1. A lightyear is a) Unit of length. b) the length light travels in one year. c) is about 10 13 km. d) all of the above. 2. Which one of the following statements on constellations is FALSE? 3. A fast probe is sent to the nearest star Alpha Centuri about 4 ly away. If the velocity of the probe is 200,000 km/hour, how long will it take to reach the star? 4. Once the probe arrives at Alpha Centuri, how long will it take its radio signal to reach the Earth announcing its arrival? 5. Which wave has the shortest wavelength? a) radio waves. b) gamma rays. c) visible light. d) ultraviolet rays. 6. How do astronomers determine the surface temperature of a star? a) by determining the wavelength of spectra at peak intensity. b) by sending a probe that crashes into the star. c) by duplicating the star energy output in the laboratory. d) by dividing the star peak wavelength by the energy output.

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AST1002- SampleTest1 - Sample Test 1 Instructions Each...

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