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Physics W8- 25 Questions

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QUESTION 1 1. How many neutrons are produced? A. 3. B. 1. C. 2. D. 12. 4 points QUESTION 2 1. An atom has 97 protons and 251 nucleons. If it undergoes alpha decay, what are the number of protons and nucleons, respectively, in the daughter nucleus? A. 94, 247 B. 95, 247 C. 96, 245 D. 100, 249 4 points QUESTION 3 1. An electron is accelerated from rest to a speed of 7.89 x 106 m/s, what potential difference did it cross? A. 512 V B. 177 V C. 300 V D. 295 V 4 points QUESTION 4 1. A magnetic flux of 50 Wb increases to 100 Wb in 10 seconds, what is the induced emf? A. 10.0 V emf is induced C. 5.0 V D. 12.0 V B. No 4 points QUESTION 5 1. The work function of a material is 3.5 eV. If the material is the illuminated with monochromatic light (l = 300 nm), what are: a) the stopping potential b) the cutoff frequency Path: p Words:0 4 points QUESTION 6 1. A circuit has two resistor in series. The first is 1000 resistor? and the second is 10,000 . If the applied voltage is 12.0 V what is the power dissipated in each Path: p Words:0 4 points QUESTION 7 1. See the figure. If net force on the 1 nC charge is zero. What is q? (n is nano and means 10 -9) A. 1.0 nC B. 0.75 nC C. 12.0 nC D. 0.68 nC 4 points QUESTION 8 1. A radioactive sample has a half-life of 2.5 min. What fraction of the sample is left after 40 min? A. 1/8 B. 1/65,536 C. 1/256 D. 1/16 4 points QUESTION 9 1. A radioactive sample has a half-life of 10.0 min. If the sample decrease by a factor of 1/16 how much time has passed? A. 20.0 min B. 15.0 min C. 40.0 min D. 10.0 min 4 points QUESTION 10 1. Calculate the binding energy of Path: p Words:0 4 points QUESTION 11 1. In the nuclear reaction e- + e+ (assume the particles are not moving to begin with), what is the net energy released in keV? A. 1,000,000 keV B. 511 keV C. 100 keV D. 1022 keV 4 points QUESTION 12 1. The energy of a 2.00 keV electron is known to within ±3.00%. How accurately can its position be measured? A. 2.1 x 10-30 m B. 8.4 x 10-30 m C. 3.0 x 10-20 m D. 1.5 x 10-10 m 4 points QUESTION 13 1. If 4.0 × 1018 atoms decay with a half-life of 9.2 years, how many are remaining after 15.2 years? A. 1.5 × 1018 B. 7.6 × 1017 C. 1.3 × 1018 D. 1.7 × 1017 4 points QUESTION 14 1. If the force between two charges decreases by a factor of 100 because the charges are moved further apart? A. 8 B. 10 C. 2 D. 16 4 points QUESTION 15 1. If light is traveling from a material with an index of refraction of 1.57 into air, what is the critical angle for total internal reflection? A. 12.1o B. 39.6o C. 97.3o D. 15.9o 4 points QUESTION 16 1. If a long current carrying wire created a magnetic field of 1.2 x 10-7 T, what is the current if you are 12.0 cm from it? Path: p Words:0 4 points QUESTION 17 1. A photon is incident on a metal that has a work function of 6.80 eV. If the longest wavelength of light is emitted, what type of light is this? A. infrared B. ultraviolet C. visible D. radio 4 points QUESTION 18 1. If a circuit has a total resistance of 24 A. 80.0 V and 2.5 x 1023 e charges flow past a terminal point in 2.0 minutes, what is the applied voltage? B. 12.0 V C. 9.00 V D. 8010 V 4 points QUESTION 19 1. An object is 25 cm from a thin lens with a focal length of 15 cm. Where is the image formed? A. 10 cm B. 39 cm C. 20 cm D. 37.5 cm 4 points QUESTION 20 1. A beam of light traveling in air is incident on a transparent plastic at an angle of incidence of 26 o. What is the angle of refraction if the index of refection of the material is 1.41? A. 26o B. 18o C. 12o D. 51o 4 points QUESTION 21 1. If an energy intensity of 2000 W is exerted by a spherical source what will be its average power output at a distance of 12 m from it? A. 3.1 W/m2 B. 4.1 W/m2 C. 1.1 W/m2 D. 2.1 W/m2 4 points QUESTION 22 1. The mass of a proton is 1.6726 × 10-27 kg and the mass of a neutron is 1.6749 × 10-27 kg. A proton captures a neutron forming a deuterium nucleus. One would expect the mass of this nucleus to be: A. any of these; it depends on the energy released during the capture. B. equal to (1.6726 + 1.6749) × 10-27 kg. C. less than (1.6726 + 1.6749) × 10-27 kg. D. greater than (1.6726 + 1.6749) × 10-27 kg. 4 points QUESTION 23 1. In the ground state, the quantum numbers (n, l, ml, ms) for hydrogen are, respectively, A. 1, 0, 0, 0. B. 1, 0, 0, ±1/2. C. 1, 1, 1, 1. D. 1, 1, 1, ±1/2. 4 points QUESTION 24 1. What is the photon energy of blue light has an energy of 5.68x10 -19 J, what is its wavelength? A. 550 nm B. 350 nm C. 450 nm D. 200 nm 4 points QUESTION 25 1. An atom has 8 protons and 17 nucleons. If it undergoes beta - decay, what are the number of protons and neutrons, respectively, in the daughter nucleus? A. 7, 16 B. 8, 17 C. 8, 18 D. 9, 17 ...
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