Medical Physics final exam 120
complete solutions.
Medical Physics final exam 120
complete solutions.
Which one of the following materials is the best insulator? - ANSWER B. rubber *
What is the wave length of a 5 Hz wave that travels with a speed of 10 m/s ? - ANSWER D. 2 m ***
The ECG does not measure: - ANSWER D. Blood flow of heart ****
Which particle is responsible for a material's magnetic properties? - ANSWER D. electron ********
What are sound waves in the range above 20,000 hertz? - ANSWER B. Ultrasound ********
Sound and light waves both - ANSWER B. obey the laws of reflection ****
Small liquid drops assume spherical shape because - ANSWER Liquid tends to have the minimum surface
area due to surface tension **********
If two bodies of different masses, initially at rest, are acted upon by the same force for the same time,
then the both bodies acquire the same - ANSWER Momentum
The refractive index for water is - ANSWER 1,33
The main idea for the eye pupil is - ANSWER To control the amount of light entering the eye
B. To control the sharpness of image forming on retina
C. To adjust the focal depth
D. All of above is correct answers ******
, Medical Physics final exam 120
complete solutions.
Which of the following is / are true concerning magnetic forces and fields? - ANSWER A charged particle
can move through a magnetic field without feeling a magnetic force.
A particle of charge -0.04 C is projected with speed 2 × 104 m/s into a uniform magnetic field, B, of
strength 0.5 T. If the particle's velocity as it enters the field is perpendicular to B, what is the magnitude
of the magnetic force on this particle? - ANSWER 400N
If a wave has frequency f=1014 Hz and speed v = 100 m/s, what is its wavelength? - ANSWER 100/10^14
= 1/10^12 = 10^-12
Two charges are separated by a distance d. If the distance between them is doubled, how does the
electric potential between them change? - ANSWER Electrical potential is 1/2
Electromagnetic waves are produced by - ANSWER Accelerating charges
What do magnetic field around a bar magnet look like? - ANSWER They curve around the ends of the
poles
Point A is at lower electrical potential than point B. An electron between them on the line joining them
will - ANSWER Move towards B
As an ultrasound pulse moves through tissue in a patient's body it will undergo a change in - ANSWER
Amplitude (energy)
Changing from a 2 MHz to a 5 MHz ultrasound transducer would generally produce: - ANSWER Shorter
wavelength // shorter ultrasound pulses
A sound source sends waves of 400 Hz. It produces waves of wavelength 2.5 m. alpha = c/f
The velocity of sound waves is: - ANSWER 1000 m/s
complete solutions.
Medical Physics final exam 120
complete solutions.
Which one of the following materials is the best insulator? - ANSWER B. rubber *
What is the wave length of a 5 Hz wave that travels with a speed of 10 m/s ? - ANSWER D. 2 m ***
The ECG does not measure: - ANSWER D. Blood flow of heart ****
Which particle is responsible for a material's magnetic properties? - ANSWER D. electron ********
What are sound waves in the range above 20,000 hertz? - ANSWER B. Ultrasound ********
Sound and light waves both - ANSWER B. obey the laws of reflection ****
Small liquid drops assume spherical shape because - ANSWER Liquid tends to have the minimum surface
area due to surface tension **********
If two bodies of different masses, initially at rest, are acted upon by the same force for the same time,
then the both bodies acquire the same - ANSWER Momentum
The refractive index for water is - ANSWER 1,33
The main idea for the eye pupil is - ANSWER To control the amount of light entering the eye
B. To control the sharpness of image forming on retina
C. To adjust the focal depth
D. All of above is correct answers ******
, Medical Physics final exam 120
complete solutions.
Which of the following is / are true concerning magnetic forces and fields? - ANSWER A charged particle
can move through a magnetic field without feeling a magnetic force.
A particle of charge -0.04 C is projected with speed 2 × 104 m/s into a uniform magnetic field, B, of
strength 0.5 T. If the particle's velocity as it enters the field is perpendicular to B, what is the magnitude
of the magnetic force on this particle? - ANSWER 400N
If a wave has frequency f=1014 Hz and speed v = 100 m/s, what is its wavelength? - ANSWER 100/10^14
= 1/10^12 = 10^-12
Two charges are separated by a distance d. If the distance between them is doubled, how does the
electric potential between them change? - ANSWER Electrical potential is 1/2
Electromagnetic waves are produced by - ANSWER Accelerating charges
What do magnetic field around a bar magnet look like? - ANSWER They curve around the ends of the
poles
Point A is at lower electrical potential than point B. An electron between them on the line joining them
will - ANSWER Move towards B
As an ultrasound pulse moves through tissue in a patient's body it will undergo a change in - ANSWER
Amplitude (energy)
Changing from a 2 MHz to a 5 MHz ultrasound transducer would generally produce: - ANSWER Shorter
wavelength // shorter ultrasound pulses
A sound source sends waves of 400 Hz. It produces waves of wavelength 2.5 m. alpha = c/f
The velocity of sound waves is: - ANSWER 1000 m/s
