A convex lens has focal length f. If an object is placed at a distance between f and 2f from the lens on the principal axis, the image is located at a distance from the lens
A) of 2f.
B) between f and 2f.
C) of f.
D) that is greater than 2f.
E) of infinity.
D
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Hydraulicists often express rainfall in acre-feet. This is the amount of water required to cover an area of one acre to a depth of one foot. There are 640.0 acres in a square mile, and 5280 feet in one mile
How many cubic feet are there in one acre-foot?
The surface temperature of the Sun can be measured using ________.
A. Bode's rule B. the Doppler shift C. Wien's law D. Kepler's third law
A cool star like Antares would produce more ________ than visible light
Fill in the blank(s) with correct word
In a hydrogen atom, the electron makes a transition from the n = 8 to the n = 3 state. What is the wavelength of the emitted photon?
A) 9.54 × 10-7 m B) 1.13 × 10-6 m C) 3.12 × 10-7 m D) 4.52 × 10-6 m E) 6.34 × 10-7 m