CTEM 1 Which has higher frequency A Red light B Violet blue light C Same frequency D Depends on how the light is made CTEM 2 An EM plane wave is described by v v E E 0 sin k z wt x B B0 sin k z wt y E x 3 2 1 c z B y Consider 3 antennas labeled 1 2 and 3 Antenna 1 is on the z axis Antenna 2 is in the xz plane above 1 Antenna 3 is is off the z axis at the location shown Rank the antennas by average signal strength received from largest to smallest A 1 2 3 B 1 2 3 C 1 2 3 CTEM 3 A point source of radiation emits power Po isotropically in all directions uniformly A detector of area ad is located a distance R away from the source What is the power p received by the detector R detector ad A Po a 2 d 4 R B a 2d Po 2 R C ad Po R D Po a 2 d R Po E None of these CTEM 4 Two radio dishes shaped like bowls are receiving signals from a radio station which is sending out radio waves in all directions with power P Dish 2 is twice as far away as Dish 1 but has twice the diameter Which dish receives more power Dish 2 is not in the shadow of Dish 1 A Dish 1 B Dish 2 C Both receive the same power Dish 1 Dish 2 CTEM 5 A parabolic dish focuses the EM radiation from a source into a beam of constant diameter D D c R The intensity of the light in the beam falls with distance R as 1 1 A I 2 B I R R 1 C I 0 constant D Something else R CTEM 6 Light from a source is partially focused so that it diverges from the source uniformly over a cone of angle 200 R c The intensity of the light in the beam falls with distance R as 1 1 A I 2 B I N N 2 R R 1 1 C I N N 2 D I 0 constant R R D Something else CTEM 7 A polarized beam of light passes through three ideal polaroid filters The filters in order 1st 2nd 3rd are tilted at 0o 45o and 90o with respect to the incoming beam s axis Does any light get through the all the filters and come out the other side E A Some light gets through c B No light gets through CTEM 8An unpolarized beam of light passes through 2 polaroid filters oriented at 45o with respect to each other The intensity of the original beam is Io What is the intensity of the light coming through both filters Hints cos45o 1 2 The average of cos2 average over all values of is cos2 1 2 Io A 1 2 Io c B 1 4 Io C 1 8 Io D 1 16 Io E None CTEM 9 Under cover of night a Girl scout signals her friends on a distant hill by alternately placing slabs of red or green JellO over her flashlight This signal is most accurately described as A Frequency modulation B Amplitude modulation CTEM 10 A row of positive charges is stationary on the ground A person with a gauss meter which measures the magnetic field is running to the right along the row of charges at the same height as the charges and in front of them in the diagram below Does the person measure a non zero B field A Yes B No v What is the direction of the B field which the moving observer measures A Up B Down C Forward direction D backward direction E no direction B field zero
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