When an object is viewed through a magnifying glass, an object 20 cm high appears as an upright image 100 cm high. What is the magnification?
5
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Which of the following best describes the meaning of the uncertainty principle as applied to an electron bound in an atom?
A) The electron follows a precise path around the nucleus, but it is impossible for us to actually measure this path. B) The electron is actually a precisely defined sphere surrounding the nucleus rather than a point, which explains why we cannot locate it at a single position. C) The electron always has a clearly defined position and velocity, but the laws of nature are set up so that, if we measure one, the other becomes instantly hidden from view. D) The electron does not really exist, and what we perceive as an electron is really just an ill-defined energy field. E) The electron is both a particle and a wave and is therefore "smeared out" around the nucleus.
The second shell of an atom can hold a maximum of ______________ electrons
Fill in the blank(s) with correct word
The unified model of active galactic nuclei focuses on differences caused by the age of the central black hole
a. True b. False Indicate whether the statement is true or false
Compound Microscope: A microscope has an objective lens of focal length 1.40 mm and an eyepiece of focal length 20.00 mm. It is adjusted for minimum eyestrain for persons with a near point of 25.0 cm. A blood sample is placed 1.50 mm from the objective. How far apart are the lenses?
A. 20 mm B. 21 mm C. 23 mm D. 41 mm