PHYS 102 CHAPTER 10 AND 11 HOMEWORK
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Things around you are emitting infrared radiation that includes the wavelength 1.49 10 5 m. What is the energy of the photons? Gamma rays (Îłrays) are highenergy photons. In a certain nuclear reaction, a Îłray of energy 0 .363 MeV (million electronvolts) is produced. Compute the In a typical electron microscope, the momentum of each electron is about 1.5 10 22 kgm/s. What is the de Broglie wavelength of the electrons? If a proton were traveling the same speed as electrons in a TV picture tube (about 7.4 10 7 m/s), what would its de Broglie wavelength be? (a) A hydrogen atom has its electron in the n = 5 level. The radius of the electron's orbit in the Bohr model is 1.323 nm. Find the de Broglie wavelength of the electron under these circumstances. (b) What is the momentum, mv, of the electron in its orbit? A hydrogen atom has its electron in the n = 2 state. A hydrogen atom initially in the n = 2 level emits a photon and ends up in the ground state. A neutral argon atom (Z = 18) is in its ground state electronic configuration. How many of its electrons are in the n = 3 level? Determine the nuclear composition (number of protons and neutrons) of the following isotopes. The isotope boron13 undergoes beta decay. Write the reaction equation and determine the identity of the daughter nucleus. The isotope astatine20 1 undergoes alpha decay. Write the reaction equation and determine the identity of the daughter nucleus The isotope silver120 * undergoes gamma decay. Write the reaction equation, and determine the identity of the daughter nucleus A Geiger counter registers a count rate of 6,80 0 counts per minute from a sample of a radioisotope. Fourteen minutes later, the count rate is 1,70 0 counts per minute. What is the halflife of the radioisotope?
An accident in a laboratory results in a room being contaminated by a radioisotope with a halflife of 4 days. If the radiation is measured to be eight times the maximum permissible level, how much time must elapse before the room is safe to enter? When the plutonium bomb was tested in New Mexico in 1945, approximately 1 gram of matter was converted into energy. Suppose another bomb is tested, and 3.4 grams of matter are converted into energy. How many joules of energy are released by the explosion? tested, and 3.4 grams of matter are converted into energy. How many joules of energy are released by the explosion?