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1 answer:
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Answer:
Explanation:
In a beta (minus) decay, a neutron in a nucleus turns into a proton, emitting a fast-moving electron (called beta particle) alongside with an antineutrino.
The general equation for a beta decay is:
(1)
where
X is the original nucleus
Y is the daughter nucleus
e is the electron
is the antineutrino
We observe that:
- The mass number (A), which is the sum of protons and neutrons in the nucleus, remains the same in the decay
- The atomic number (Z), which is the number of protons in the nucleus, increases by 1 unit
In this problem, the original nucles that we are considering is iodine-131, which is
where
Z = 53 (atomic number of iodine)
A = 131 (mass number)
Using the rule for the general equation (1), the dauther nucleus must have same mass number (131) and atomic number increased by 1 (54, which corresponds to Xenon, Xe), therefore the equation will be:
Answer:
.
Explanation:
If the mass of an object is and the velocity of that object is
, the linear momentum of that object would be
.
Assume that the initial velocity of the mass is positive (.) However, the direction of the velocity is reversed after the impact. Thus, the sign of the new velocity of the object would be negative- the opposite of that of the initial velocity. The new velocity would be
.
Thus, the change in the velocity of the mass would be:
.
The change in the linear momentum of the mass would be:
.
Thus, the magnitude of the change of the linear momentum would be .
The period of the musical note is seconds.
Answer: Option A
<u>Explanation:</u>
The frequency is defined as the number of oscillations or a complete cycle of wave occurred in a given time interval. So the frequency is inversely proportional to the time period. Thus the mathematical representation of frequency with time period is
As the frequency is given as , the time period can be found as
Thus,
Thus the time period for the frequency of the musical note is seconds.