Why is it difficult to directly measure the size of a star's disk from Earth?
What will be an ideal response?
Our turbulent atmosphere blurs the star's image and enlarges it.
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What type of eruption does a shield volcano have?
What will be an ideal response?
As you’ve learned from Part B, hydrogen and helium gas never condense under conditions found in the solar nebula. The remaining three categories of material in the solar nebula are shown again here. Rank these materials from left to right based on the distance from the Sun at which they could condense into a solid in the solar nebula, from farthest to closest.
What will be an ideal response?
Which of the following greatly improves the angular resolution of radio maps?
A) Schmidt corrector plates B) more sensitive spectrometers C) switching from film to CCD imaging D) use of interferometers E) chilling the infrared detectors
A person's eye lens is 2.7 cm away from the retina. This lens has a near point of 25 cm and a far point at infinity
(a) What must the focal length of this lens be in order for an object placed at the near point of the eye to focus on the retina? (b) What must the focal length of this lens be in order for an object placed at the far point of the eye to focus on the retina?