Mass Spectrometer Practice Problems質(zhì)譜儀的實(shí)際問(wèn)題

1、.Mass Spectrometer Practice ProblemsName:AP PhysicsPeriod: A mass spectrometer consists of three major parts: an acceleration chamber, a velocity selector and the mass spectrometer chamber. In the acceleration chamber, atoms are ionized by having electrons stripped away and the ions are then acceler

2、ated by an electric potential. Once they leave the acceleration chamber, they pass through a velocity selector where an electric field and a magnetic field work together to allow only ions with the exact right speed to pass through; any ion going too fast or too slow is steered off course and never

3、makes it to the mass spectrometer. In the mass spectrometer, a magnetic field steers the moving ion in a circular path with the radius of the circle being proportional to the ions mass.1. An ionized deuteron (a hydrogen atom with a neutron in the nucleus) passes to the east into a velocity selector

4、built with an electric field of 8.0 kV/m upward and a magnetic field of 40 mT to the north. How fast is the ion moving if it goes straight through the velocity selector?2. A pure sample of hydrogen is sent through a mass spectrometer.a) After having their single electrons removed the hydrogen ions a

5、re sent through a velocity selector. The velocity selector is created with a magnetic field of 0.75 T pointing downward and an electric field of 1500 N/C pointing west. What is the velocity of the ions that make it through the velocity selector?b) The singly ionized atoms are sent into a mass spectr

6、ometer with a magnetic field of 1.5 mT downward, where they travel in semicircular arcs before landing on the detector at three different points: 2.78 cm from the entrance, 5.57 cm from the entrance and 8.35 cm from the entrance. What is the mass for the isotope of hydrogen that lands at each point?

7、3. A velocity selector built with a 0.5 T magnetic field and a perpendicular 1750 N/C electric field feeds into a mass spectrometer with a 0.8 T magnetic field. A sample of air is ionized and fed into the mass spectrometer.a) What velocity will the particles that pass through the velocity selector a

8、nd into the mass spectrometer be traveling?b) If the particles passing into the mass spectrometer are singly ionized oxygen (2.65601774 × 10-26 kg), singly ionized nitrogen (2.32526486 × 10-26 kg) and double ionized nitrogen (2.32526486 × 10-26 kg), how far away from the entrance will

9、 each different kind of particle land? (Assume semicircular arcs)4. You are trying to design a cheap mass spectrometer that will only have a single detector element, which is positioned 50 cm away from the entrance to the mass spectrometer chamber. Your plan is to change the magnetic field strength

10、for different substances to get them all to hit the single detector. a) You use a velocity selector constructed around a 2000 N/C electric field and a 4 T magnetic field. How fast will the particles that make it into the velocity selector be going?b) How strong will the magnetic field in the mass sp

11、ectrometer need to be for each of the following particles to get it to hit the detector?i) triply ionized uranium (3.95292579 × 10-25 kg)ii) singly ionized iron (9.28821405 × 10-26 kg)iii) doubly ionized helium (6.64647825 × 10-27 kg)5. In a mass spectrometer, a singly charged ion pas

12、s through a velocity selector built with an electric field of 1.0 x 103 V/m to the east and a magnetic field of 1.0 T upward. It then passes into the deflector chamber, which uses the same magnetic field as the velocity selector, and moves in a circular path with a radius of 1.2 cm. What is the mass of the ion?6. In a mass spectrometer, a doubly charged ion having a particular velocity is selected by using a magnetic filed of 100 mT perpendicular to an electric field of 1.0 kV/m. The same magnetic field is used to deflect the ion in a c