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Electrons And Energy
Test Description: Calculations with wavelength, frequency, and energy
Instructions: Answer all questions to get your test result.
1) To calculate the frequency of an electromagnetic wave, you need to know the speed of the wave and its:
A
intensity
B
wavelength
C
amplitude
D
energy
2) What is the frequency of a light wave with a wavelength of 680 nm (6.8 e - 7 m)
A
2.04 e 9 Hz
B
2.04 s
C
4.41 e 14 Hz
D
2.27 e - 15 Hz
3) An electromagnetic wave in a vacuum has a wavelength of 0.07m. What is its frequency?
A
4.3 e 8 m/s
B
3.0 e 8 m/s
C
4.3 e 9 Hz
D
3.0 e 9 Hz
4) Use Plank's constant to solve the following. What is the amount of energy carried by a photon that has a frequency of 5.71 e 14 Hz.
A
3.78 e -19 J
B
8.62 e 47 J
C
525 nm
D
1.16 e -8 J
5) Infrared rays have a shorter wavelength than
A
radar waves
B
gamma rays
C
ultraviolet rays
D
x rays
6) A photon is emitted from an atom with an energy of 4.25 e -19 J. What is the wavelength of the photon?
A
4.69 e -7 m
B
1.28 e -10 m
C
6.42 e 14 m
D
2.73 e -4 m
7) For an electron in an atom to change from the ground state to an excited state,
A
energy must be gained
B
the electron must move from a higher to a lower energy level
C
energy must be released
D
radiation must be emitted
8) A student records the following electron configuration for the element Arsenic: 1s2 2s2 2p6 3s2 3p6 4s2 4d10 4p3. Is this correct? Why or why not?
A
It is not correct because there are not enough electrons
B
It is a correct electron configuration.
C
It is not correct because there are too many electrons
D
It is not correct because the 4d should be 3d
9) The statement that no two electrons in the same atom can have the same four quantum numbers is a restatement of:
A
Bohr's Law
B
Hund's Rule
C
Aufbau Principle
D
Pauli Exclusion Principle
10) Oxygen has an electron configuration of 1s2 2s2 2p4, how many unpaired electrons does oxygen have?
A
3
B
1
C
4
D
2
*select an answer for all questions
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