Describe (using words and diagrams) how an NMR signal is generated as a nuclear spin relaxes....
Describe (using words and diagrams) how an NMR signal is generated as a nuclear spin relaxes. Explain the result of the excitation-relaxation cycle; show what happens with the progression of time. Explain how we get a peak from the raw data.
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Homework Answers
Subatomic particles like electron,proton and neutron can be imagined as spinning on their axes.
If the number of neutrons and the number of protons are both even,then the nucleus has no spin.
If the number of neutrons plus the number of protons is odd,then the nucleus has a half integer spin.
If the number of neutrons and the number of protons are both
odd,then the nucleus has an integer spin.
Relaxation refers to the phenomenon of nuclei returning to their
thermodynamically stable states after being excited to higher
energy levels.The two types of relaxation are spin lattice
relaxation(T1) and spin spin relaxation (T2).
Spin lattice relaxation(T1) -T1 is the time it takes for the 37% of bulk magnetization to recovery along Z-axis from the X-Y plane.The more efficient the relaxation process,the smaller relaxation time value we get.
Spin spin relaxation(T2)- T2 is the time it takes for the spins to lose coherence with one another.T2 can either be shorter or equal to T1.
By integration,we get the peaks from raw data.Integration is the measurement of peak areas on the NMR spectrum.It corresponds to the amount of energy absorbed or released by all nuclei participating in chemical shift during the nuclear flip process
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Describe (using words and diagrams) how an NMR signal is
generated as a nuclear spin relaxes....
Describe (using words and diagrams) how an NMR signal is generated as a nuclear spin relaxes. Exp...
Describe (using words and diagrams) how an NMR signal is generated as a nuclear spin relaxes. Explain the result of the excitation-relaxation cycle; show what happens with the progression of time. Explain how we get a peak from the raw data. Will rate for answers :)
Describe three medical devices in the healthcare industry and explain how they work. Use block diagrams/...
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Describe three medical devices in the healthcare industry and explain how they work. Use block diagrams/ figures to illustrate your answers. Your answer should include: 3 marks) a. Describing the sensors used b. Describing any signal conditioning&signal processing algorithms used (what is their purpose, how does the algorithnm work (in layman's terms). 4 marks .3 marks c. Describe the system architecture of the device (~100-200 words for each medical device, use diagrams if necessary)
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how
are melting points used
Answer these questions before coming to the lab and turn in your answers at the beginning of the lab to get credit. Turning this pre lab question sheet later would result in not getting any credit for the pre lab. Period T is defined as the time required for an object with mass M attached to a string length L to complete one cycle of motion. For small oscillations of a pendulum we have T=21V...
1. Write an equation that describes voltage supplied by
a wall outlet.
(f = 60 Hz, Vrms = 120 V)
2. What is the instantaneous voltage of a sine wave at
half of a period?
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