Magnifying Glass With the Image at the Near Point of the Eye: Consider a magnifying glass with a power of 3.0 diopters.(a) What is the maximum angular magnification for a person with a near point at 25 cm?(b) What is the angular magnification when viewing with a relaxed eye?
Fill in the blank(s) with the appropriate word(s).
(a) 1.75 (b) 0.75
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The wavelengths that are most likely for communication with other civilizations are those in the water hole
Indicate whether the statement is true or false
If the wavelength of an electromagnetic wave is about the radius of the earth, what type of radiation is it?
A. X-ray B. Visible light C. Microwave D. Radio wave E. Wavelengths can't be that big.
Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 2 sin (4x) cos (3t) where x is in m and t is in s. What is the speed (in m/s) of the interfering waves?
a. 0.75 b. 0.25 c. 1.3 d. 12 e. 3.0
A charged particle moving perpendicular to a magnetic field has a magnet force on it. But when an observer moves with the particle, so that the particle has a relative velocity of zero with respect to the observer, one would expect there would be no magnetic force. Yet there is still a force. If it is not a magnetic force, then what is the source of this force?
a. It is an electrical force. b. It is due to the ether. c. It is a gravitational force. d. It is something other than any of the above.