Imagine a source emitting 100 W of green light at a wavelength of 500 nm. How many photons per second are emerging from the source?

Q: A 1000 W gas discharge lamp emits 5.00 W of UV radiation in a narrow range centered on 285 nm. How…

A: The energy of the photon is given by Where h = Planck constant = 6.626 × 10- 34  J.s, c = Speed of…

Q: A certain helium-neon laser pointer, emitting light with a wavelength of 632 nm, has a beam with an…

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Q: The average threshold of dark-adapted (scotopic) vision is 4.00 x 10-11 W/m2 at a central wavelength…

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Q: The human eye is a complex sensing device for visible light. The optic nerve needs a minimum of…

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Q: The energy flux of sunlight reaching the surface of the earth is 1.388 x 10° W/m?. How many photons…

A: The concept behind this is the dual nature of radiation and matter. We have been provided with…

Q: A dental X-ray typically affects 194 g of tissue and delivers about 3.6 µJ of energy using X-rays…

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Q: The human eye can barely detect a star whose intensity at the earth’s surface is 1.6 x 10-11 W/m2.…

A: The energy at the human eye with the given intensity, E1=IAt=I4πr2t   Substitute, E1=1.6×10-11…

Q: If all the energy from a 107 W light bulb is emitted on average at 666.0 nm, how many 666.0 nm…

A: Given data:  Wavelength of photon (λ) = 666.0 nm Rate of energy (P) = 107 W = 107 J/s Required:…

Q: A 76-kW AM radio station broadcasts at 1000 kHz. How many photons are emitted each second by the…

A: The wavelength of light and energy per unit photon are inversely related. The energy of a photon is…

Q: The threshold of dark - adapted (scotopic) vision is 4.0 x 10-11 W/m2 at a central wavelength of…

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

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Q: An FM radio station broadcasts at a frequency of 98.1 MHz. The power radiated from the antenna is…

A: The energy E of a photon is given by E = hf where h the Planck's constant f is the frequency

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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Q: The intensity of sunlight hitting the surface of the earth on a cloudy day is about 0.50 kW/m2.…

A: I=Intensity=0.5 kW/m2d=Diameter of eye=2 mmr=Radius of eye=22=1 mmλ=Wavelength=550 nmt=Time=1 s

Q: lightbulb emits about 7.45W of visible light. (The other 109.55W are emitted as infrared radiation…

A: Energy of photon = hv h = planks constant= 6.6 × 10-34 Js v = Frequency of photon

Q: A 1.00 mW helium-neon laser emits a visible laser beam with a wavelength of 633 nm. How many photons…

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Q: Exposure to a sufficient quantity of ultraviolet light will redden the skin, producing erythema—a…

A: Given: The first energy that produce reddening is E1=3.7 mJ. The first wavelength is λ1=254 nm. The…

Q: The average threshold of dark-adapted (scotopic) vision is 4.00 x 10-11 W/m? at a central wavelength…

A: Photons are particles of light. Each photon will have a discreet amount of energy given by, E=hcλ…

Q: The average threshold of dark-adapted (scotopic) vision is 4.00  10-11 W/m2 at a central wavelength…

A: Calculate the total energy. Total energy = Intensity x area                     = 4x 10-11 x π (9 x…

Q: The threshold of dark-adapted (scotopic) vision is 2.8 ✕ 10−11 W/m2 at a central wavelength of 500…

A: The number of photons that enter the eye is, n=EEr Write the expression for the energy of a single…

Q: A 193-nm-wavelength UV laser for eye surgery emits a 0.500 mJ pulse. How many photons does the light…

A: The expression for find number of photons contains in the light pulse is n=Ehcλ

Q: The threshold of dark-adapted (scotopic) vision is 4.0 × 10−11 W/m2 at a central wavelength of 500…

A: It is given that,

Q: An FM radio station of frequency 98.1 MHz puts out a signal of 50,000 W. How many photons/s are…

A: Given data f=98.1 MHzP=50000 W

Q: Suppose a linear accelerator (linac) creates a X-ray beam where every individual photon has an…

A: Energy of a single photon is E=  19MeV = 19 x 106 cVTotal number of photon is n = 3 x 1010Total time…

Q: energy flux of sunlight reaching the surface of the earth is 1.388 x 10^3 W/m^2. How many photons…

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Q: A recent study found that electrons that have energies between 3.45 eV and 20.5 eV can cause breaks…

A: Solution: Given: c = speed of light = 3.00 x 108 m/s h = Planck's constant = 6.63 x 10-34 J.s E2 =…