Lernkarten

Karten 47 Karten
Lernende 16 Lernende
Sprache English
Stufe Universität
Erstellt / Aktualisiert 23.01.2017 / 31.01.2019
Lizenzierung Keine Angabe
Weblink
Einbinden
0 Exakte Antworten 1 Text Antworten 46 Multiple Choice Antworten
Fenster schliessen

Human ear shows the highest sensitivty for sounds characterized by Frequencies:

between 10 - 20 000 Hz

of aprox. 1000 Hz

of aprox 3000 Hz

of aprox. 10 000 Hz

Fenster schliessen

Blood velocity in the vessels can be estimated when applying:

fMRI

Infrared waves

Measurements of pulse frequency at different sites

Calculations of the acoustic resistances

Doppler Effect

Fenster schliessen

Indicate proper statement regarding X and gamma rays

a) gamma rays are corpuscular and X rays are electromagnetic

b) gamma rays are electromagnetic and X rays are corpuscular

c) gamma and X-rays are both corpuscular but consist of different elementary particles

d) gamma and X-rays have both electromagnetic nature

e) gamma and X rays have the same frequency spectrum

Fenster schliessen

The feature that a lens focuses the light not at a focal point but at a blurred spot is referred to as:

a) chromatic aberration

b) spherical aberration

c) astigmatism

d) diffraction

e) refraction

Fenster schliessen

Typically, the wavelength of absorbed photon is:

a) Longer than that of the emitted one

b) Equal to that of the emitted one

c) Shorter than that of the emitted one

d) Is shortened due to radiationless transitions

e) Equal to the Larmor’s precession frequency

Fenster schliessen

The energy of interaction between the magnetic moment and the external magnetic field is minimal when:

a) Magnetic moment and magnetic field are antiparallel

b) Magnetic moment and magnetic field are parallel

c) Magnetic moment and magnetic field are perpendicular

d) The angle between magnetic moment and magnetic field is 135 degrees

e) The energy of interaction does not depend on the angles between these quantities

Fenster schliessen

In the MRI scanning, the gradients of magnetic field are used to: 

a) Enhance the intensity of the signal

b) Facilitate the phenomenon of magnetic resonance

c) To get rid of radiationless transitions in the nuclei

d) To enable examination of a defined tiny part (slice) of the patient’s body

e) To facilitate the T2 relaxation time

Fenster schliessen

Indicate in which units is measured the ECG signal:

a) Volts/time

b) Ampers/time

c) Volts

d) Ampers

e) Tesla