22. The beta+ particle is another name for a(n): a. electrorn b. alpha particle
ID: 1581529 • Letter: 2
Question
22. The beta+ particle is another name for a(n): a. electrorn b. alpha particle c. Helium nucleus d. positrorn 23. Match the following terms with the appropriate unit for electromagnetic waves: 1, Hertz 2. Meter 3. Second wavelength a. b. c. frequency 24. Potassium's atomic number is 19, one of the naturally occurring isotopes of potassium is "k. How many neutrons does this nucleus contain? 25. If a 60 kev photon strikes an inner shell electron with a binding energy of 26 kev, the resulting photoelectron (ejected electron) will have an energy of a. 60 kev b. 34 kev c. 32 kev d. 26 kev 26. A radioactive source has a half-life of 17 days. What is the mean (average) life? 27. Radon is a decay product of naturally occurring uranium. Radon is also a daughter product of Radium decay. In the decay of 1 Ra to Rn, another particle is present. What is this particle? What is it's mass?Explanation / Answer
22. beta + particle is also known as positron
23.
wavelength measuered in meters
period measured in seconds
frequency measured in Hz
so the answer is a-2 ,b-3,c-1
24.
potassium atomic number is 19 , in 40 K , ther are
isotope is having same atomic number but different mass number
so the 40 K has the 40-19 nuetron = 21
there are 21 neutrons in 40 K with atomic number 19 ( number of electrons)
where as mass number is ( N+P)
25.
if a 60 keV photon strikes an inner shell electron with a binding energy of 26 keV, the resulting photoelectron will have energy of
it will have the enetg of 34 keV difference of energies
26 .
from the relation T 1/2 = 0.693* T_mean
T_mean = T_1/2/0.693
T_mean = 17/0.693 days
T_mean = 24.53 days
27.
an alpha particle will present
the mass of alpha particle is 6.64424*10^-27 kg
4He2
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