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Question 1: In fact, a ________ decays this way with a mean lifetime of about 15 minutes.
NeutronElectronAtomProton

Question 2: The two up quarks and one ________ of the proton are held together by the strong force, mediated by gluons.
Down quarkTop quarkCharm quarkStrange quark

Question 3: Since the atomic number of ________ is 1, a positive hydrogen ion (H+) has no electrons and corresponds to a bare nucleus with 1 proton (and 0 neutrons for the most abundant isotope 11H).
OxygenNitrogenHydrogenHelium

Question 4: It is composed of three fundamental particles: two up quarks and one ________.
Charm quarkTop quarkStrange quarkDown quark

Question 5: However, protons are known to transform into ________ through the process of electron capture (also called inverse beta decay).
NeutrinoAtomNeutronAtomic nucleus

Question 6: However, since particles from different gases had different values of charge-to-mass ratio (e/m), they could not be identified with a single particle, unlike the negative electrons discovered by ________.
John Strutt, 3rd Baron RayleighJ. J. ThomsonMarie CurieWilliam Henry Bragg

Question 7: Protons are observed to be stable and their empirically observed ________ is at least 6.6×1035 years.
Nuclear fissionHalf-lifeCosmic rayRadioactive decay

Question 8: The proton is a subatomic particle with an ________ of +1 elementary charge.
Electric chargeMagnetic fieldElectric currentElectromagnetism

Question 9: Because the Solar Wind ________ made continuous measurements, it was possible to measure how the Earth's magnetic field affects arriving solar wind particles.
SpectrometerAstronomyLightPhoton

Question 10: The nucleus of the most common isotope of the hydrogen ________ is a lone proton.
AtomElectronMatterPhoton
















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