What combination of quarks produces a neutron and what are the electric charges on these quarks, expressed in terms of e?
What will be an ideal response?
udd, with charges +(2/3)e, -(1/3)e, and -(1/3)e
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Which type of molecules, vital to our life, was found in Murchison and similar carbonaceous chondrites?
A) amino acids B) DNA C) lipids D) sugars E) vitamins
Sort these materials in order of increasing dielectric constant: paper, vacuum, air
What will be an ideal response?
Is it possible to have a macroscopic sample of oxygen that has a mass of 14 atomic mass units?
A) Yes, but it would need to be made of oxygen atoms that each had less than the normal number of neutrons. B) No, this is less than than the mass of a single oxygen atom. C) Yes, but it would have the same density as nitrogen. D) No, because oxygen is a gas at room temperature.
Electrons are used to produce X-rays by allowing a beam of electrons to strike a heavy metal surface. What is true about the wavelengths of the characteristic X-rays that are produced in such a situation?
A. There is a continuous range of wavelengths produced, up to a maximum that depends on the energy of the electron beam used. B. There is a single wavelength of X-ray produced that depends on the energy of the electron beam used. C. There are a few specific wavelengths that are produced for a given metal and their wavelength is independent of the energy of the electron beam used. D. There is a continuous range of wavelengths produced, down to a minimum that depends on the energy of the electron beam used.