State which of the following statements are true and which are false:a)After two half-lives, all radioactive nuclei in a substance will have decayed.b) A resistor R and a capacitor C connected in parallel combine as = + àc)A photon travels along multiple paths from a star to a Geiger counter.d)The brighter the light illuminating a photocathode, the higher the energy of the electronsemitted.e)When a photon travels from a star to your eye, in its frame of reference the duration of itsjourney and the distance travelled are both zero.

a) Half life is defined as the time in which half of the original number of nuclei decays. so in the…

Answered: State which of the following statements…

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Carbon-14, with a half-life of 5730 years, has a decay constant of λ = 1.21 × 10-4 yr-1. A piece of wood from an archaeological site is found to have 1.9 % of its original carbon-14. How many years old (t) is the piece of wood? Express your answer in scientific notation. Example: 1.23e4.
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The uranium decay series from U-238 to stable lead (Pb-206) is: U → Th → *Pa → U → 0Th → Ra → Rn → 18Th → Pb → Bi 238U 234TH 226 → Po 92 92 210Pb → 210 Bi → 210P0 → 206Pb 83 84 Of the 15 nuclei from U-238 to Pb-206, list those radionuclides that are alpha-particle emitters, and those that are beta-particle emitters. State your reasons.
Time 0 t₁2 20₁2 3₁/12 Number of nuclides, N x 10³ 1000 750 500 90/2 10/₁2 250 125 0 12 212 312 412 512 612 7h2 8h2 9h12 10/2 Time in multiples of t₁/2 The figure shows a typical radioactive decay (amount of undecayed nucleus (N) vs. time (t)) from a heavy nucleus. Such a decay may be best expressed by an equation like : ON = N₂ (xt) ON=N₂/λt -λt ON = N₂e N = N₂ e-1/At N 1,000,000 500,000 250,000 125,000 62,500 31,250 15,625 7,813 3,906 1,953 977 412 5/₁/2 61₁2 7h2 81/2
If 88 (atomic number) 228 (atomic mass) ?? is produced, determine the parent isotope for each of the following types of decay and justify your answer. a) alpha decay b) beta negative decay c) beta positive decay
State which of the following statements are true and which are false: a) After two half-lives, all radioactive nuclei in a substance will have decayed. b) A resistor R and a capacitor C connected in parallel combine as G = + c) A photon travels along multiple paths from a star to a Geiger counter. d) The brighter the light illuminating a photocathode, the higher the energy of the electrons emitted. e) When a photon travels from a star to your eye, in its frame of reference the duration of its journey and the distance travelled are both zero.
56 (5) Fe has a mass defect of 0.58872 amu. What is its binding energy per nueleon? 26 (6) For the nuclear reaction 14 4. 17 N. +. He -> H. Calculate the energy in joules associated with the reaction of one atom of nitrogen-14 with one atom of He-4, given that the isotopic masses in amu are: N-14 (14.00307); He-4 (4.00260); O-17 (16.99991); and H-1 (1.007825).
Uranium-235 decays spontaneously by nucleon emission. a) Write a balanced equation to show the decay of Uranium-235, 2U, that leads to the formation of Uranium- 235 234 and name all the particles involved b) Write a balanced equation to show the decay of Uranium-235, U, that leads to the formation of 92 Thorium-231. Name all the particles involved.
Consider the following three statements i) Beta-decay results in a daughter nuclide that has a mass number one greater than the parent nuclide. ii) All stable nuclei have equal no of protons and neutrons. iii) The photon is a mediating particle for one of the four fundamental forces. Which of the following is correct? a) Only i) is true. b) Only ii) is true. c) Only iii) is true. d) Only i) and ii) are true. e) Only i) and iii) are true. f) Only ii) and iii) are true. g) None are true. h) All are true.