As you saw in Part C, stellar parallax exists only because Earth orbits the Sun. Therefore, if the ancient Greeks had measured stellar parallax, they would have known that their belief in an Earth-centered universe was wrong. Why didn't the ancient Greeks measure stellar parallax?
A. Some Greeks actually did measure it, but they did not understand the importance of their measurements.
B. Even for the nearest stars, parallax angles are too small to measure with the naked eye.
C. Their belief in an Earth-centered universe meant that they did not expect parallax, and therefore did not look for it.
D. The Greeks thought all the stars were the same distance away, residing on a celestial sphere.
Ans: B. Even for the nearest stars, parallax angles are too small to measure with the naked eye.
You might also like to view...
Surface air temperature is generally measured at 4 ft. above the ground because
What will be an ideal response?
Which forms of light are lower in energy and frequency than the light that our eyes can see?
A) infrared and radio B) ultraviolet and x-rays C) visible light D) infrared and ultraviolet
A pair of crossed Polaroids will transmit light
A) of sufficiently long wavelengths. B) that itself is polarized. C) if a third Polaroid at about 45 degrees is inserted between the two.
A long straight wire is parallel to one edge and is in the plane of a single-turn rectangular loop as shown. If the loop is changing width so that the distance x changes at a constant rate of 4.0 cm/s, what is the magnitude of the emf induced in the loop at an instant when x = 6.0 cm? Let a = 2.0 cm, b = 1.2 m, and I = 30 A.
A. 5.3 ?V B. 2.4 ?V C. 4.8 ?V D. 2.6 ?V E. 1.3 ?V