Physics
7th Edition
ISBN: 9780321625915
Author: Douglas C. Giancoli
Publisher: PEARSON
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Chapter 27, Problem 20Q
To determine
Why spectra of Lyman series only observed when light passes through the hydrogen gas at room temperature.
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Children playing in a playground on the flat roof of a city school lose their ball to the parking lot below. One of the teachers kicks the ball back up to the children as shown in the figure below. The
playground is 6.10 m above the parking lot, and the school building's vertical wall is h = 7.40 m high, forming a 1.30 m high railing around the playground. The ball is launched at an angle of
8 = 53.0° above the horizontal at a point d = 24.0 m from the base of the building wall. The ball takes 2.20 s to reach a point vertically above the wall. (Due to the nature of this problem, do not
use rounded intermediate values-including answers submitted in WebAssign-in your calculations.)
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18.1
m/s
(b) Find the vertical distance (in m) by which the ball clears the wall.
0.73
✓ m
(c) Find the horizontal distance (in m) from the wall to the point on the roof where the ball lands.
2.68
m
(d) What If? If the teacher always launches the ball…
It is not possible to see very small objects, such as viruses, using an ordinary light microscope. An electron microscope can view such objects using an electron beam instead of a light beam. Electron microscopy has proved invaluable for investigations of viruses, cell membranes and subcellular structures, bacterial surfaces, visual receptors, chloroplasts, and the contractile properties of muscles. The "lenses" of an
electron microscope consist of electric and magnetic fields that control the electron beam.
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x = d = 0.0100 m.
(a) the position of the electron
y, = 2.60e1014
m
(b) the…
Chapter 27 Solutions
Physics
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