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Atomic Spectra — Unit test Answers

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Which statement is part of Bohr's atomic model?

A
Electrons absorb or emit light when they change energy levels.
B
Electrons with the highest energy are found with orbits of the smallest radius.
C
Electrons exist as waves and clouds of probability with specific orbits and shapes.
D
Electrons orbit the nucleus in narrow ellipses, like how the planets orbit the Sun.
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What type of spectrum is shown below?

Question illustration
A
absorption
B
electromagnetic
C
emission
D
infrared light
23

Which are methods of reducing exposure to ionizing radiation? Check all that apply.

A
using a lead apron during medical X-rays
B
picking up radioactive material by hand to avoid dropping it
C
taking an X-ray image of large areas of the body at once
D
using a short burst of X-rays to take an image
E
taking an image of the smallest possible area
24

What is the energy equivalent of an object with a mass of 2.5 kg?

A
5.5 × 108 J
B
7.5 × 108 J
C
3.6 × 1016 J
D
2.25 × 1017 J

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