Radioactive by-products mostly occur when atomic nuclei
1) break apart,
2) combine together,
and radioactive by-products are a chief result of atomic nuclei
3) breaking apart.
4) combining together.
5) doing neither.
Answer: 1, 3
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The measured value of the speed of light is about 300,000 km/s. Suppose a futuristic space train is traveling at 200,000 km/s with its headlights on. If you could measure the speed of the light from the headlights, you would find it to be
A) 300,000 km/s. B) 200,000 km/s. C) 100,000 km/s. D) 500,000 km/s.
Evidence that the cosmic background radiation really is the remnant of a Big Bang comes from predicting characteristics of remnant radiation from the Big Bang and comparing these predictions with observations
Four of the five statements below are real. Which one is fictitious? A) The cosmic background radiation is expected to have a temperature just a few degrees above absolute zero, and its actual temperature turns out to be about 3 K (actually 2.7 K). B) The cosmic background radiation is expected to have a perfect thermal spectrum, and observations from the COBE spacecraft verify this prediction. C) The cosmic background radiation is expected to contain spectral lines of hydrogen and helium, and it does. D) The cosmic background radiation is expected to look essentially the same in all directions, and it does. E) The cosmic background radiation is expected to have tiny temperature fluctuations at the level of about 1 part in 100,000. Such fluctuations were found in the COBE data.
A star has a parallax angle of 0.019 seconds of arc. How far away is this star from Earth?
What will be an ideal response?
Potential of Point-Charges: A +5.0-µC point charge is 12 cm from a -5.0-µC point charge. What is the magnitude of the electric field they produce at the point on the line connecting them where their electric potential (relative to infinity) is zero? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 0 N/C B. 12.5 MN/C C. 0.75 MN/C D. 25 MN/C E. 1.5 MN/C