An atom which has 4 protons and 6 neutrons will be electrically neutral if it contains

A) 4 electrons.
B) 6 electrons.
C) 10 electrons.
D) at least 1 electron.


A) 4 electrons.

Physics & Space Science

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A spring with a spring constant of 8.0 N/m is compressed to 20 cm. If the spring is uncompressed initially, then the work done is

A. 0.12 J. B. 0.16 J. C. 0.19 J. D. 0.22 J. E. 0.26 J.

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Gasoline is useful in cars because it has

A) chemical potential energy. B) electrical potential energy. C) kinetic energy. D) gravitational potential energy. E) radiative energy.

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A nonrelativistic electron is confined to a length of 500 pm on the x-axis. What is the kinetic energy of the electron if its speed is equal to the minimum uncertainty possible in its speed?

(h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19 J) A) 0.015 eV B) 0.15 eV C) 1.5 eV D) 15 eV E) 150 eV

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