The boy walked in the evening in the park with the flashlight with a power of 20 W . The flashlight bulb is monochromatic and emits photons with a wavelength 590 nm . When the boy came home, he took out a light bulb from the flashlight, connected it to the battery, and placed it in front of a sheet of paper with the dimensions 20cm×30cm at a distance of 1.2 m from it. a) How many photons per second fall on a piece of paper? To complete the first step, you need to find the ratio A between the area of a sheet of paper and the surface area of a sphere with a radius of 1.2 m . b) If you stand 17 mm from this bulb, how many photons enter each of your eyes per second? Assume your pupil is 5.0 mmmm in diameter and that the bulb radiates uniformly in all directions

Q: Under ideal conditions, a visual sensation can occur in the human visual system if light of…

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Q: A 0.254-nm photon collides with a stationary electron. After the collision, the electron moves…

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Q: An 80 W light source (eg a bulb) consumes predictably 80 W of electrical power. Assume that all of…

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Q: A 100-W bulb emits red light ( = 700 nm) uniformly in all directions. a) How many photons are…

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Q: What is the maximum velocity (in m/s) of electrons ejected from a material by 86 nm photons if the…

A: The maximum velocity of electrons ejected from a material by a photon of a certain energy can be…

Q: A light beam of wavelength 431 nm and intensity 159 W/m^2 shines on a target of area 2.86 m^2 for a…

A: Given data:  Wavelength (λ) = 431 nm Intensity (I) = 159 W/m2 Area (A) = 2.86 m2 Time (t) = 2.12 s…

Q: Station KAIM in Hawaii broadcasts on the AM dial at 870 kHz, with a maximum power of 50,000 W. At…

A: From the expression of work function, E=hcλE=hf                   ∵f=cλ

Q: If 5 percent of the energy supplied to an incandescent light buld is radiated as visible light, how…

A: Given : wavelength of visible light = 560 nm

Q: a laser produces a short pulse of light whose energy equals 0.20 J. The wavelength of the light is…

A: Given data E'=0.2 Jλ=694 nm

Q: When a metal was exposed to photons at a frequency of 1.47 × 1015 s-1, electrons were emitted with a…

A: When photons fall on a metal , the energy of the photon , which is , E=hν , will be used for the…

Q: A boy walks in the evening in the park with a flashlight with a power of 25 W . The flashlight bulb…

A: Power of flashlight (P) = 25 W wavelength of photons = 490 nm

Q: A 0.393-nm photon collides with a stationary electron. After the collision, the electron moves…

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Q: A boy walks in the evening in the park with a flashlight with a power of 25 W . The flashlight bulb…

A: Given: Power of bulb P=25 W=25 J/s, Wavelength of light λ=490 nm=490×10-9 m, Distance from bulb R=17…

Q: In a photoelectric experiment, a metal is irradiated with light of energy 3.56 eV. If a braking…

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Q: Two sources of light emit X-rays of wavelength 1 nm and visible light of wavelength 500 nm,…

A: Given data- λ1=1 nmλ2=500 nmP=200 W

Q: A study of photosynthesis in phytoplankton in the open ocean used short pulses of laser light to…

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Q: In an experiment on the photoelectric effect, the cesium cathode of a photocell is struck by a…

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Q: During an experiment 8.7×10¹4 Hz light shines on a metal plate and the Photoelectric Effect occurs.…

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Q: Photoelectrons from a material with a binding energy of 2.71 eV are ejected by 420-nm photons. Once…

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Q: Photoelectrons from a material whose work function is 2.27 eV are ejected by 502 nm photons. Once…

A: Given Data :Work Function of the material φ = 2.27 eVwavelength of incident photon λ =  502 nmmass…

Q: The graph below shows the maximum kinetic energy of emitted photoelectrons as a function of the…

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Q: A photon has a frequency of 5.00 E14 Hz and is incident on a material that ha work function is 1.62…

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Q: Photoelectrons from a metal with a work function of 2.74 eV are ejected by photons with a wavelength…

A: work function (w) = 2.74 eV wavelength of incident photons = 415 nm

Q: A light beam of wavelength 538 nm and intensity 279 W/m^2 shines on a target of area 2.53 m^2 for a…

A: Given data:  Wavelength (λ) = 538 nm Intensity (I) = 279 W/m2 Area (A) = 2.53 m2 Time (t) = 2.07 s…

Q: The 1.0 mW light beam from a laser pointer (λ = 670 nm) shines on a screen. How many photons strike…

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Q: Multiple-Concept Example 3 reviews the concepts necessary to solve this problem. Light is incident…

A: Work function (Φ) = 2.3 eV => Φ = 2.3 × 1.6 × 10-19 J => Φ = 3.68 × 10-19 J Speed of the…

Q: Compare the de Broglie wavelength of a bullet moving at 700 miles per hour (313 m/s) to that of an…

A: To solve the given question we need to use de Broglie wavelength formula: λ=hmv Where 'h' is the…

Q: The cut-off potential for photoelectrons emitted by a surface hit by wavelength light of 4910…

A: The cut off potential is the applied reverse potential such that the photocurrent is 0. From…

Q: In a photoelectric experiment visible/white light (λ = 400 to 700nm) falls on a metal with work…

A: Note:  Out of given multiple parts, we solve first three unless specified. You can resend the…

Q: The boy walked in the evening in the park with the flashlight with a power of 20  W  . The…

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Q: How many photons per second are emitted by a monochromatic lightbulb (660  nm) that emits 45  W   of…

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Q: A 0.703-nm photon collides with a stationary electron. After the collision, the electron moves…

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Q: Dinoflagellates are singlecell creatures that float in the world’s oceans; many types are…

A: Given data Number of photons emitted, n=100000000=108 Time , t=0.1s sec Wavelength of the light…

Q: The threshold of dark-adapted (scotopic) vision is 4.5 ✕ 10−11 W/m2 at a central wavelength of 500…

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de Broglie Equation

The sketch of matter waves is drawn below: