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smity711
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need some help please :)
Had major paper due today, didn't have much time for my physics hw, and now I am stumped on some. Anyone got ideas, I have to turn it in tommorow! Thanks for any help you can give!
1. A microscope has an objective lens with a focal length of 16.22mm and an eyepiece with a focal length of 9.50mm. With the length of the barrel set at 29.0cm, the diamter of a red blood cell's image subtends an angle of 1.43mrad with the eye. If the final image distance is 29.0 cm from the eyepiece, what is the actual diamter of the red blood cell?
2. Calculate the energy, in electron volts, of a photon whose frequency is
a) 620 THz
b) 3.1 GHz
c) 46.0 MHz
d) Determine the cooresponding wavelengths for these photons and state the classification of each on the electromagnetic spectrum
3. The threshold of a dark-adapted (scotopic) vision is 4 * 10^-11 W/m^2 at a central wavelength of 500nm. If light with this intensity and wavelength enters the eye when the pupil is open to its maxiumum diamter of 8.5mm, how many photons per second enter the eye?
4. Lithium, beryllium, and mercury have work functions of 2.3 eV, 3.9 eV, and 4.5 eV, respectively. If 400nm light is incident on each of these metals, determine
a) which metals exhibit the photoelectric effect and
b) the maxium kinetic energy for the photoelectrons in each case
5. Xrays with an energy of 300 keV undergo compton scattering from a target. If the scattered rays are deflected at 37.0 degrees relative to the direction of the incident rays, find
a) the compton shift at this angle
b) the energy of the scattered xray
c) the kinetic energy of the recoiling electron
Had major paper due today, didn't have much time for my physics hw, and now I am stumped on some. Anyone got ideas, I have to turn it in tommorow! Thanks for any help you can give!
1. A microscope has an objective lens with a focal length of 16.22mm and an eyepiece with a focal length of 9.50mm. With the length of the barrel set at 29.0cm, the diamter of a red blood cell's image subtends an angle of 1.43mrad with the eye. If the final image distance is 29.0 cm from the eyepiece, what is the actual diamter of the red blood cell?
2. Calculate the energy, in electron volts, of a photon whose frequency is
a) 620 THz
b) 3.1 GHz
c) 46.0 MHz
d) Determine the cooresponding wavelengths for these photons and state the classification of each on the electromagnetic spectrum
3. The threshold of a dark-adapted (scotopic) vision is 4 * 10^-11 W/m^2 at a central wavelength of 500nm. If light with this intensity and wavelength enters the eye when the pupil is open to its maxiumum diamter of 8.5mm, how many photons per second enter the eye?
4. Lithium, beryllium, and mercury have work functions of 2.3 eV, 3.9 eV, and 4.5 eV, respectively. If 400nm light is incident on each of these metals, determine
a) which metals exhibit the photoelectric effect and
b) the maxium kinetic energy for the photoelectrons in each case
5. Xrays with an energy of 300 keV undergo compton scattering from a target. If the scattered rays are deflected at 37.0 degrees relative to the direction of the incident rays, find
a) the compton shift at this angle
b) the energy of the scattered xray
c) the kinetic energy of the recoiling electron