Assume that the sun rotates about an axis through its centre and perpendicular to the plane of rotation of the earth about the sun. The appearance of the sun, from any one point on the earth, is shown

Question

Assume that the sun rotates about an axis through its centre and perpendicular to the plane of rotation of the earth about the sun. The appearance of the sun, from any one point on the earth, is shown (Figure 6.108: a disc with its rotation axis vertical through the points A (top) and B (bottom); C is on the left edge and D on the right edge). Light belonging to a particular spectral line, as received from the points A , B , C , D on the edge of the sun, is analyzed:

TestHub · Accepted Answer

Points A and B lie on the axis, so they do not move along the line of sight and show the unshifted wavelength (D true, A false). C and D are on opposite edges: one approaches and the other recedes. The printed key takes D as receding, so D shows the longer wavelength.

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