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Biophysics Final

Optics, Hearing, NMR, Thermodynamics etc.

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Flashcards	47
Students	16
Language	English
Category	Physics
Level	University
Created / Updated	23.01.2017 / 31.01.2019
Weblink	https://card2brain.ch/box/20170123_biophysics_final
Embed	<iframe src="https://card2brain.ch/box/20170123_biophysics_final/embed" width="780" height="150" scrolling="no" frameborder="0"></iframe>

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For the open system the chemical potential (µ) for a given compound can be described as

a) The energy of chemical reaction

b) The electrical potential created by chemical reactions

c) The redox potential at an electrode

d) The energy required for introduction of 1 mole of the compound

e) Susceptibility to catalyze a specific chemical reaction

When cells are suspended in a hypotonic solution:

a) They tend to swell due to solvent transport into the cytoplasm

b) They tend to swell due to ion transport into the cytoplasm

c) They tend to shrink due to solvent transport into the cytoplasm

d) They tend to shrink due to ion transport into the cytoplasm

e) Osmotic pressure occurs but the volume of cells does not change

In the harmonic movement a particle is oscillating around the equilibrium point and A denotes the amplitude i.e. the maximum absolute distance of particle from the equilibrium point. Indicate the situation in which the absolute value of the harmonic force (F) is reaching its maximum: (y – distance from equilibrium point, -A ≤ y ≤ A).

a) Particle is localized at the equilibrium point (y = 0)

b) Particle is halfway between equilibrium and amplitude (i.e. y=-0.5A or y=0.5A)

c) Particle is at its maximum displacement from the equilibrium (i.e. y=-A or y=A)

d) When the particle velocity is maximal

e) The value of harmonic force is constant

If the medium density increases two times but the speed of acoustic wave propagation does not change then the acoustic impedance is

a) Increased two times [density - impedance proportional when velocity constant]

b) Decreased two times

c) Increased four times

d) Decreased four times

e) Not changed

The incoming acoustic stimulus has induced a deformation of the basilar membrane very close to the oval window. We may deduce that the detected voice

a) Is characterized by a low frequency

b) Is characterized by a high intensity level

c) Is characterized by a high frequency

d) Is characterized by a low intensity level

e) Is characterized by a short time duration

Relaxation time T1 describes the process (symbols: M_z is the component of magnetization M parallel to external magnetic field B_o)

a) In which the Mz is being dissipated

b) In which synchronicity of magnetic moments precession is increased

c) In which the value of Mz is being rebuilt after a pulse of electromagnetic wave with magnetic field perpendicular to Bo (so called 90o pulse)

d) In which a deformed atomic lattice is returning to its resting state

e) In which atoms start synchronous oscillations

Find the true statement

a) Spin-lattice interaction is described by T1 relaxation time and spin-spin interaction by T2 relaxation time

b) Spin-lattice interaction is described by T2 relaxation time and spin-spin interaction by T1 relaxation time

c) The intensity of the external magnetic field Bo reduces the T1 relaxation time and increases the T2 relaxation time

d) The intensity of the external magnetic field Bo reduces the T2 relaxation time and increases the T1 relaxation time

e) The increase in the crystal temperature is measured after the 90o pulse

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