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SAMPLE-MIDTERM

SAMPLE-MIDTERM - Instructions Each multiple choice question...

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Instructions Each multiple choice question has one answer. Mark the closest answer. Points are not subtracted for incorrect answer. Circle the correct answer on these test sheets. Make sure it is clear which answer you have marked. Limit your answer to the last two questions in the provided space. After grading the instructor will return this test with your grade back to you. Anyone discovered to have cheated will fail the course. Useful information 1 hour = 3600 sec. 1 year = 3.16 × 10 7 sec. c = 3 × 10 8 m/sec = 3 × 10 5 km/sec n-nano = 10 -9 . μ - mico = 10 -6 . m-mili = 10 -3 . k-kilo = 10 3 . M-mega = 10 6 . 1 AU = 1.53 × 10 11 m = 1.53 × 10 8 km. 1 ly = 9.5 × 10 15 m = 9.5 × 10 12 km. p 2 = a 3 . F = Gm 1 m 2 /d 2 . F=ma. W = mg. G = 6.67 × 10 -11 Nm 2 /kg 2 . t(time) = Distance/velocity. Perihelion = a(1-e); aphelion a(1+e) M = 4 π² R ³ /(GP ² ). Mp 2 = a 3 . E = h f = hc/ λ . f λ = c. v r / c = Δλ / λ . v esc = (2GM/R) ½ . v(gas molecule) ~ (T/M) ½ . W / W(Earth) = [M/M(Earth)]/[R/R(Earth)] ² v esc / v esc (Earth) = ([M/M(Earth)]/[R/R(Earth)]) ½ . α (arc sec) = 11.6 / D(diam in cm). α (arc sec) = 0.02 λ (nm) / D(cm). M = f o / f e . °K = °C + 273; λ max (cm) = 0.29 / T(°K). E = F(lux)A(rea) E = σ A T 4 . Small angle α (arc sec) = 206,000 × Size(d) / Dist(D). Density = Mass / volume. Circumference = 2 π r. Area (circle) = π r 2 . Area (sphere) = 4 π r 2 . Volume (sphere) = (4/3) π r 3 .

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1. Light year is a measure of a. Light intensity b. Time c. Distance d. The length of time in a year. 2. Why do astronomers use Astronomical Unit (AU)? a. It is a convenient unit of length for planetary distances . b. The significance of this unit is lost in history. c. It is the only unit that relates speed of light to distance. d. Newton’s Law of Gravity is simplifies when using this unit. 3. The speed of radio waves in space is: a. Slower than the speed of X rays. b. The same as speed of visible light. c. Less than the speed of ultraviolet rays. d. All of the above are true statements. 4. Which one of the following statements on constellations is FALSE ? c . The constellations will have the same pattern, no matter how far the observer is in our galaxy. d. The brightest star in a constellation is given the designation α . 5. The reason we have seasons on Earth is: 6. Which planet has seasons similar to the Earth? a. Mercury. b. Venus. c . Mars. d. Uranus.
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SAMPLE-MIDTERM - Instructions Each multiple choice question...

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