Answer all.
4) Red light (wavelength = 650 nm) is shining on a metal target. If 1,000 photons hit the target 1) Which of the following is not one the four fundamental forces? every second, what is the maximum kinetic energy energy that an emitted electron could have? A) Gravitational force A) 4.3 x 10 40 ] B) Tension force B) 4.3 x 10 37 C) Electromagnetic force ) 3 x 10-19 ] D) Strong nuclear force D) 3 x 10-16 ) Weak nuclear force ) 650,000 J 2) A Geiger Mueller counter, when switched on in the classroom, clicks 14 times in one minute. How many times will it click in the next minute? ) Again 14 times B) Less than 14 times C) More than 14 times D) It will not click at all, because the first minute was just a fluke and the air is not actually radioactive 5) Suppose you are building a space heater by word space heater by connecting a wire to a large battery. Which of the following changes would not increase the temperature of the wire? E) We cannot know ahead of time. It could again be 14 clicks, but it could be more or less. A) Replacing the wire with a lo of the same thickness and type B) Replacing the wire with a thicker one of the same length and type ) Replacing the wire with a wire with less resistivity but same length and thickness 3) If an electromagnetic plane wave is traveling upwards away from the ground and the electric field of the wave is pointing to the west, what direction is the magnetic field pointing? ) Replacing the battery with a battery of greater voltage without changing the wire E) Waiting some time after connecting the wire A) Down into the ground 3) North C) East ) South E) West Question 2 (10%). A friend is holding an Question 1 (10%). Four identical arrow attached to a R3 resistors are connected to a battery stick and is moving the stick closer and as shown in the figure. M closer to a curved A) Suppose the current through R1 is /1 = 8 A. Calculate /2 and /4, the m mirror as shown in the figure. You are currents through Rz and R4, watching the espectively. reflection of the Side view of you looking at the object Front view of you looking at the object arrow in the mirror in front of the mirror in front of the mirror as the stick is moved. A) What will the reflection look like when the stick is far from the mirror? Will the image of the arrow be upside down? Will the image seem to be behind the mirror or in front of the mirror? Will the image be a real image or a virtual image? Justify your answer with a ray diagram. B) Suppose the voltage across R1 is AV1 = 12 V. Calculate AV2 and AV4, the voltages across R2 and R4, respectively. B) What will the reflection of the arrow look like when the stick is close to the mirror? Will the image of the arrow be upside down? Will the image seem to be behind the mirror or in front of the mirror? Will the image be a real image or a virtual image? Will the image be larger or smaller than the image in part A? Justify your answer with a ray diagram. C) How many times hotter is R3 than R1
