PHYSICS 3LC PRACTICAL QUESTIONS AND ANSWERS ALREADY PASSED
what does a photometer do? - Answers it converts light into electrical current
what are photons? - Answers tiny quantized packets of light
what happens in the photoelectric effect? - Answers light hits a metal and electrons are emitted
what should the digital multimeter be set to? - Answers voltage
isotropic vs collimated sources? - Answers a desk lamp is an isotropic source, a laser is a
collimated source
why is it necessary to collimate the light source before using the prism to disperse the light? -
Answers so that the light rays entering the prism are parallel
if a light of certain wavelength is bent more in glass what does that mean? - Answers that it has
a greater index of refraction
interference filters attenuate all light wavelengths other than the red wavelength. What would
you see if you used one of these filters? - Answers a red line
why does a gas discharge tube have a certain color? - Answers it has only certain colors
because the gas radiates only a few discrete wavelengths
when light passes through a slit who's size is comparable to the wavelength of light, the screen
shows which of the following? - Answers bright spots due to constructive interference of light
waves, and dark spots due to destructive interference of light waves
diffraction grating - Answers a large number of equally spaced parallel adjacent slits
if you have a beam of microwaves, what is the width of the slits image? - Answers a beam of
microwaves are not visible therefore the width of the slit image remains the same as the width
of the slit
what limits the resolution of the eye under optimal conditions? - Answers the diameter of the
pupil
what is the one and only way a sealed alpha source can hurt you? - Answers by ingestion
Does the absorption of the Heidbrinkions depend on the atomic charge of the absorber, Z? -
Answers YES
Along the x-axis they plot ρx, where x is the thickness. Along the y-axis they plot the number of
counts. On the graph, the mass absorption coefficient is given by what? - Answers The negative
of the slope of the line
is diffraction important? - Answers diffraction will be somewhat important
what does a photometer do? - Answers it converts light into electrical current
what are photons? - Answers tiny quantized packets of light
what happens in the photoelectric effect? - Answers light hits a metal and electrons are emitted
what should the digital multimeter be set to? - Answers voltage
isotropic vs collimated sources? - Answers a desk lamp is an isotropic source, a laser is a
collimated source
why is it necessary to collimate the light source before using the prism to disperse the light? -
Answers so that the light rays entering the prism are parallel
if a light of certain wavelength is bent more in glass what does that mean? - Answers that it has
a greater index of refraction
interference filters attenuate all light wavelengths other than the red wavelength. What would
you see if you used one of these filters? - Answers a red line
why does a gas discharge tube have a certain color? - Answers it has only certain colors
because the gas radiates only a few discrete wavelengths
when light passes through a slit who's size is comparable to the wavelength of light, the screen
shows which of the following? - Answers bright spots due to constructive interference of light
waves, and dark spots due to destructive interference of light waves
diffraction grating - Answers a large number of equally spaced parallel adjacent slits
if you have a beam of microwaves, what is the width of the slits image? - Answers a beam of
microwaves are not visible therefore the width of the slit image remains the same as the width
of the slit
what limits the resolution of the eye under optimal conditions? - Answers the diameter of the
pupil
what is the one and only way a sealed alpha source can hurt you? - Answers by ingestion
Does the absorption of the Heidbrinkions depend on the atomic charge of the absorber, Z? -
Answers YES
Along the x-axis they plot ρx, where x is the thickness. Along the y-axis they plot the number of
counts. On the graph, the mass absorption coefficient is given by what? - Answers The negative
of the slope of the line
is diffraction important? - Answers diffraction will be somewhat important
