Lernmaterialien für Biophysics an der Pomeranian Academy of Medicine in Szczecin

1. Which of the following methods 
2. (PET, ESR, NMR, and USG) is
3.  for free radicals detection?

1. PET
2. NMR
3. ESR
4. USG

1. Which sentence is true?

1. The lower the frequency, the higher the pitch of the sound 
2. The higher the frequency, the higher the pitch of the sound
3. The lower the frequency, the same the pitch of the sound
4. The higher the frequency, the lower the sound

1. A piece of radioactive
2.  substance gives a received
3.  rate of 6000 counts per minute
4. in detector whose efficiency
5. is known to be only 2%.
6.  If the sample contains 10^10 atoms,
7. what is the decay constant (lambda)
8. of this radioactive substance? WTF
   
   
   

1. 2*10^-9 s^-1
2. 10^-8 s^-1
3. 10^-7 s^-1
4. 5*10^-7 s^-1

1. Lenses are sometimes 
2. rated not by focal length but 
3. by a unit called a diopter.  
4. The diopter is simply one
5. divides by the focal length in meter.  
6. Given focal length,
7. f1 = 20 cm, and f2 = (-) 50 cm.
8.  Calculate number of diopter
9. (power) and focal length in
10. c for combination this lenses:

1. 3D, 20cm
2. 2D, 33c
3. 2D, 50cm
4. 3D, 33cm

All listed types of radiation are of the same nature except:

Required to answer. Single choice.

(0/1 Point)

a) X-ray,

b) gamma radiation,

c) alpha radiation,

d) cosmic radiation.

2.

Residual volume is about 1 liter. With the strong effort of expiration one can diminish residual volume by:

a) 0 ml,

b) 100 ml,

c) 200 ml,

d) 500 ml

3. Magnification of microscope is 150; magnification of microscope eyepiece is 10. What is the magnification of objective?

a) 1200

b) 130

c) 15

d) 110

4.Which of the following frequencies are in the ultrasound range?

16 Hz

15 000 Hz

15 MHz

1 600 Hz

5. Density of liquid is equal to 1 g/cm3; choose correct values in other units:

0,1 kg/dm3, and 1000 kg/m3

1 kg/dm3, and 1000 kg/m3

1 kg/dm3, and 10 000 kg/m3

10 kg/dm3, and 106 kg/m3

6.

A contraindication for the X-ray test is:

a) pregnancy,

b) a pacemaker,

c) hypertension,

d) none of the answers is correct.

7. Energy of electromagnetic wave is:

proportional to wavelength

proportional to frequency

inversely proportional to frequency

inversely proportional to frequency and wavelength

8. In the Computed Tomography (CT) scanners:

X-rays are attenuated in tissues, depending on the tissue density

X-rays are attenuated in tissues, depending on elastic properties of the tissue

X-rays echo (result of EM waves reflection from tissues) is detected by RF coils

Gamma rays are attenuated in tissues, depending on the tissue density