Question

What is the energy of a single photon that has a wavelength of 420
nm? What is the energy of a mole of photons with this
wavelength?

Answer #1

Wavelength = 420 nm = 420 x 10^{-9} m

Energy of single photon = (h * c) /

where h = Planck's contant = 6.626 x 10^{-34} J.s

c = speed of light = 3.0 x 10^{8} m/s

= wavelength = 420 x 10^{-9} m

Substituting the values

Energy of single photon = (6.626 x 10^{-34} J.s * 3.0 x
10^{8} m/s) / (420 x 10^{-9} m)

**Energy of single photon = 4.73 x 10 ^{-19}
J**

Energy of one mole of photon = (Energy of single photon) * (Avagadro's number)

Energy of one mole of photon = (4.73 x 10^{-19} J) *
(6.022 x 10^{23})

Energy of one mole of photon = 2.85 x 10^{5} J

**Energy of one mole of photon = 2.85 x 10 ^{2}
kJ**

Photon A has a wavelength of 200 nm and Photon B has a
wavelength of 700 nm. Indicate if the following statement is about
these photons is True (T) or False (F):
Photon A is moving faster than Photon B

Gamma rays are photons with very high energy.
What is the wavelength of a gamma-ray photon with energy 625 keV
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How many visible-light photons with a wavelength of 500 nm would
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1. If 0.500 mole of photons with a wavelength of 200.0 nm have
an energy equal to 302 kJ, what is the energy of 0.500
mole of photons with a wavelength of 400.0 nm?

(6pts) Can You See a Single Photon? The
wavelength corresponding to the maximum sensitivity
of the human eye is 510 nm, the limit of sensitivity of the
dark-adapted eye has been shown to be correspond to
a 100 ms flash of light of total energy 240 eV. (Little Shop of
Physics- Colorado State University)
1 J = 6.241509 x 1018 eV
a) What is the energy
of a single photon at this wavelength?
b) How many photons
does the flash...

a) What is the energy of a photon (in eV) that has a wavelength
of 466 nm? (3 digit answer)
b) What is the energy (in eV) of a photon that has a wavelength
of 460 nm?
c) What is the wavelength of a photon that has 2.1 eV of kinetic
energy? (format of a.b x 10-c m )
d) a photoelectric surface has a work function of 2.00 eV. What
is the threshold frequency of this surface? (format of
a.bc...

what is the wavelength of a photon that has two times less
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A hydrogen atom in the ground state absorbs a photon of
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What energy level does the electron reach?
This excited atom then emits a photon of wavelength 434.1 nm.
What energy level does the electron fall to?
-I know this question has already been asked on Chegg but each
question I go to has different calculations and I can't get the
right answer.

What is the energy (in joules) of a single photon of light with
a wavelength of 4.80X10-7 meters?

Green light has a wavelength of 505nm. What is the energy, in
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An atom absorbs a photon with wavelength 500 nm and subsequently
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a) Determine the energy absorbed by the atom.
b) Assume that the atom is a solid particle with mass 3.3×10−26
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it has emitted the photon, assuming that any additional energy it
acquired only contributed to its motion.
Can you do part b step by step, which equations are
required?

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