During a lightning storm, you will be safe in a car, because ... a) the Lorentz's screening phenomenon. 8. b) the Millikan's sphere phenomenon. c) the Faraday's cage phenomenon. d) the Maxwell's shield phenomenon.
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- 7. For each law listed below, chose the correct physical description of that law from the choices listed. Put the letter of your choice in the corresponding box (or just list out your choices in order on your exam). LAW LETTER CHOICE a. Lorentz Force Law, F= qE + qö xB b. Gauss' Law: Qin O E dA = c. Gauss's Law for Magnetism: B dA =0 d. Faraday's Law: E· ds dt е. Ampere-Mаxwell Law: B. ds = Hol + EgHo" dt Letter Physical Meaning of Law A Circulating magnetic fields are created by electric currents and by changing electric fields. Diverging magnetic fields do not exist; There are no isolated magnetic poles. B An electric force is exerted on a charged particle in an electric field. A magnetic force is exerted on a charged particle moving in a magnetic field. Diverging electric fields are created by charged particles. D E Circulating electric fields are created by changing magnetic fields.In a CRT, electrons leave the filament as the current through the filament heats it upt. An anode then attracts the free electrons. According to Newton's second law of motion, the beam of electrons that emerges from the anode aperture will do this. a. Decelerate until they reach the fluorescent screen. b. Continue accelerating toward the flourescent screen. c. Spontaneoulsy decay into photons. d. Move at a constant speed toward the fluorescent screen.What is the essential difference between gamma rays and green light? A. Gamma rays have an electric field, green light do not. B. There is no essential difference in the nature of gamma rays and green light other than he difference in frequency and wavelength. C. Greenlight undergoes refraction, gamma rays I do not D. Gamma rays are a form of radiation, green light is not E. Greenlight is the beam of photons, gamma rays are not photons
- A photon of light has a frequency of 5.00 x 1014 Hz. If the frequency of the photon was doubled then which of these would happen to the energy of this photon? a. it would become one-fourth as much b. it would become half as much c. it would double d. it would quadruple e. it would tripleAfter you calibrate the SpectroVis Plus spectrometer, you must a. run a full spectrum by selecting Sensors/Calibrate/Full Spectrum. O b. change the mode by selecting Sensors/Time-Based. Oc. collect a full spectrum of the sample to determine the wavelength of maximum absorbance. O d. change the mode by selecting Sensors/Data Collection.1. Calculate the theoretical value of e/m using the known values of the electric charge andelectron mass. 2. A student performs this lab using a pair of coils with radius R = 10 cm and N = 98 windings.Using the equation in the theory, calculate the magnetic field at the center of both coils when thecoil current is 4.3 A.3. Using the same coil current as question 2, the student measures a beam radius of 7.5 mmwhen the accelerating voltage is 70 V. Using equation 5 in the theory (and your B-field fromquestion 2) calculate the value of e/m.4. Calculate the percent error between your result for question 3 and the theoretical value of e/m.