Oae atomic mass unit (amu) is defined to be the mass a proton a neutron one-twel

Question

Oae atomic mass unit (amu) is defined to be the mass a proton a neutron one-twelfth the mass of the C -12 atom all of the above When tbonum-234 emits a beta particle, thorium transforms to protactinium-232 protactmium-233. protactinium-234 protactinium-235 How many 350-Mm(UV) photons are needed to provide a total energy of 2.5 J? h = 6.63 times 10^-34 L.s, c = 3.00 times 10^8 m/s 5.3 times 10^16 photons 4.4 times 10^19 photons 5.3 times 10^16 photons 9.4 times 10^18 photons Of alpha. beta. and, gamma radiation, two are high-speed particles, and the one that isn't is alpha. Beta. Gamma. all of the above are different forms of electromagnetic waves. Which of these cannot be separated by electrical or magnetic means? Alpha. Beta. Gamma. All of the above can be separated by passing beams through a magnetic or electric field. The symbol for a certain isotope of radium is 226 88 ra. How many neutrons are there in the nucleus of .his isotope?

Explanation / Answer

29. D. all of the above.

Explanation:- One unified atomic mass unit is approximately the mass of onenucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol. It is defined as one twelfth of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state, and has a value of 1.660539040(20)×1027 kg.

30. c)

Explanation:-

thorium-234, which is the decay product of uranium-238, in turn beta-decays into protactinium-234 by emitting an electron:

90-thorium-234 ====> 91-protactinium-234 + beta particle (electron)

31. (b) 4.4*10^19 photons

Explanation:- The energy of a photon E = h*c/

h = 6.63*10^-34 J-s (Planck's constant)
c = 3.00*10^8 m/s (Speed of light)
= 350*10^-9 m (Wavelength)

E = 5.7*10^-19 J n = 2.5/5.7 * 10^19 = 4.4*10^19 photons

32. c. gamma

33. D.

34. No. of neutrons = 226 - 88 = 138 nos.

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