Which of the following do the atoms 14N and 15N have in common?
A) total number of neutrons and electrons
B) number of protons
C) total number of protons and neutrons
D) number of neutrons
B
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A force acts on an object for a time. If one eighth the force had acted for twice as long, the impulse would have been ________ as much as before.
What will be an ideal response?
An electron and a positron, both essentially at rest, annihilate each other, emitting two identical photons in the process
What is the wavelength of these photons? The mass of an electron or positron is 9.11 × 10-31 kg. (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s) A) 3.07 pm B) 1.21 × 10-12 pm C) 2.42 pm D) 1.73 pm E) 3.46 pm
In terms of an atom's electron configuration, the letters K, L, M, and N refer to
A) different shells with n equal to 1, 2, 3, or 4 respectively. B) different sub shells with ? equal to 1, 2, 3, or 4 respectively. C) the four possible levels for the magnetic quantum number. D) the four possible quantum numbers. E) none of the above answers.
When light enters a material of higher index of refraction, its speed
A) decreases. B) first increases then decreases. C) stays the same. D) increases. E) first decreases then increases.