EC (1 point): In class we talked about the connection between Faraday's Law (emf produced by changing flux) and the func

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EC (1 point): In class we talked about the connection between Faraday's Law (emf produced by changing flux) and the function of an AC transformé. What was the purpose of the iron core? O it is the 'wire' through which current flows between the two coils O it acts as a temporary magnet that guides the field in the primary coil through the secondary coil O it determines whether the transformer 'steps-up' or 'steps-down' the voltage O it acts as a permanent magnet, guiding the static magnetic field through each coil it transfers the emf of the primary coil to the secondary coil O it provides structural support so that the two coils do not touch each other directly.

EC (2 points): The photoelectric effect provides strong evidence that... (select all that apply) a single photon interacts with a single electron when a photon impacts a metal, all of the energy is absorbed by a single electron O monochromatic light is composed of a stream of discrete particles a single photon interacts with a single atom when a photon impacts a metal, the energy is shared between electrons in the vicinity of impact monochromatic light is composed of multiple photon frequencies

You're in lab playing around with a photo-electric experiment (see below). It has a light source on which you can select the wavelength and change the intensity, and the voltage between the cathode and anode can be adjusted (AV), all while reading out the photo-current with an ammeter. The blue dots with green arrow are electrons. Light Window Intense light Ammeter Weak light AV Vstop 0 1 V AV You turn on the ammeter and the voltage across the cathode and anode. Then you flip on the light and the ammeter reads 0.0 amps (meaning, no electrons are traveling from the left to the right under the current conditions). Assume that AV is a small positive number. Which of the following actions could result in a non-zero current?. [Select] O Cathode Anode

You turn on the ammeter and the voltage across the cathode and anode. Then you flip on the light and the ammeter reads 0.0 amps (meaning, no electrons are traveling from the left to the right under the current conditions). Assume that AV is a small positive number. Which of the following actions could result in a non-zero current? [Select] Select] making Delta V negative increasing the intensity decreasing Delta V increasing the wavelength of light voltage.... [Select] decreasing the wavelength of light decreasing the intensity increasing Delta V You make the necessary adjustments, and a photo-current begins to flow. If you decrease the wavelength of light hitting the cathode, how will that affect the stopping voltage (Vstop)? [Select]

You turn on the ammeter and the voltage across the cathode and anode. Then you flip on the light and the ammeter reads 0.0 amps (meaning, no electrons are traveling from the left to the right under the current conditions). Assume that AV is a small positive number. Which of the following actions could result in a non-zero current? [Select] The stopping voltage (Vstop) is the voltage.... [Select] [Select] below which (.e. more negative) all electrons will be securely held within the metal (cathode) below which (i.e. more negative) current can be driven in reverse of the normal photon-induced current below which (i.e. more negative) no electrons will reach the far plate after absorbing the energy of an incoming photon You make the necessary adjustments, and a wavelength of light hitting the cathode, how that gives any escaping electron enough kinetic energy to annihilate an incoming photon that decelerates the photon to a stop before hitting the metal (cathode) [Select]

could result in a non-zero current? [Select] The stopping voltage (Vstop) is the voltage... [Select] You make the necessary adjustments, and a photo-current begins to flow. If you decrease the wavelength of light hitting the cathode, how will that affect the stopping voltage (Vstop)? [Select] Select it depends on the intensity of the illuminating light this is a non-ohmic device, so there is no relationship between stopping voltage and wavelength it will not affect the stopping voltage it will decrease the stopping voltage (i.e. more negative) it will increase the stopping voltage (i.e. more positive) it will only change the stopping voltage if the frequency of light is below the threshold frequency