The intensity of the radiation field of an antenna is inversely proportional to the distance from the antenna
Indicate whether the statement is true or false
FALSE
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A muon formed high in the Earth's atmosphere travels at a speed 0.870c for a distance of 4.00 km before it decays. What is the muon's lifetime as measured in its reference frame?
a. 3.1E–5 s b. 7.6E–6 s c. 1.5E–5 s d. 5.1E–5 s e. 4.3E–5 s
What is unusual about the motion of Phobos, as seen from the surface of Mars?
What will be an ideal response?
Consider the image formed by a refracting telescope. Suppose an opaque screen is placed in front of the lower half of the objective lens. What effect will this have?
A) The top half of the image will be blacked out. B) The lower half of the image will be blacked out. C) The entire image will be blacked out, since the entire lens is needed to form an image. D) The image will appear as it would if the objective were not blocked, but it will be dimmer. E) There will be no noticeable difference in the appearance of the image with the objective partially blocked or not.
A gate automatically opens when the water gets too high. How high above the hinge must the water be for the gate to just open?
(A) 0.6 m
(B) 1.2 m
(C) 1.8 m
(D) 2.4 m