In alpha decay, an unstable nucleus decays into a daughter nucleus and a^4_2He n

Question

In alpha decay, an unstable nucleus decays into a daughter nucleus and a^4_2He nucleus a^2_1H nucleus a neutron a neutrino an electron The rest-mass energy equivalent in joules (j) of a proton is most nearly 0 1.9 times 10^-44J 5.0 times 10^-19 J 1.5 times 10_10 J 940J In the Bohr model of the hydrogen atom, an electron in an initial level of higher energy can change to a final level of lower energy by emitting a photon absorbing a photon emitting a neutrino absorbing a neutrino emitting an antineutrino Electrons are emitted from a certain metal if light of frequency greater than 6.0 times 10^14 hertz is Incident on the surface. However, no electrons are emitted if light of lower frequency is used. The minimum energy in joules (J) necessary to free an electron from this metal is most nearly 0 1.1 times 10^-48 J 6.6 times 10^-34 J 1.3 times 10^-27 J 4.0 times 10^-19 J The masses of an electron, a proton, and a neutron compare as m_e

Explanation / Answer

69- a) Helium nucleus

70- d) 1.5 x10^-10 J

71- a) Emitting a photon

72- e) 4x10^-19 (planck's constante times the frequency)

73- B) de Broglie wavelength

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