EC (2 points): The photoelectric effect provides strong evidence that (select all that apply) 11 a single photon interac
Posted: Thu Jun 09, 2022 3:44 pm
- Ec 2 Points The Photoelectric Effect Provides Strong Evidence That Select All That Apply 11 A Single Photon Interac 1 (24.1 KiB) Viewed 371 times
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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 OG Ammeter A Weak light Cathode -AV - V stop 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] 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 (Vetop) is the voltage.... (Select] [Select] below which (i.e. more negative) all electrons will be securely held within the metal (cathode) below which (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 (.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
You're standing in a room dimly lit by a single light bulb, trying to read a book. The bulb is hanging at head / book height a distance d away and is emitting light equally in all directions, but the intensity of light just isn't enough to see clearly. You start walking toward the light and when you reach a distance d/5 you can finally read the book. How much brighter (more intense) is the light at this new position as compared to the original place you were standing?
In a recent lecture (and a recent pre-lecture video) we looked at 'hot' objects, like an incandescent light bulb filament, that emit electromagnetic radiation called 'black body radiation' (aka 'thermal radiation', sometimes aka 'full spectrum). Select the statement(s) below that correctly identify aspects of this phenomenon. the total emitted radiation power increases with increasing temperature the peak wavelength of emitted radiation decreases with increasing temperature cooler objects emit "bluer' light the colors of a neon sign are created because the current going through the lamp heats the gas until it gives off black body radiation the colors/wavelengths present in sunlight are primarily due to black body radiation if you look at light from a hot object through diffraction glasses, you will see distinct spectral lines the hotter the object, the 'redder' the light that is emitted