Question

What is the minimum photon energy needed to dissociate
^{2}H (deuterium)?

Answer #1

Given that there are 1430.83333 g of deuterium in an 85,000 L
swimming pool, and given deuterium is 0.0150% of natural hydrogen,
find the energy released in joules if this deuterium is fused via
the reaction 2H + 2H → 3He +
n.

) i. Calculate the Energy of light needed to
dissociate the O-O bond in 3O2 to form
3pO + 3pO; (ground state O2 → O +
O)
ii. What is the wavelength of this light in meters or
nanometers
iii. What is the closest region of the atmosphere – to earth-
that this energy available.

A photon (in a vacuum) travels at the speed of light with energy
E. What is the minimum energy required for the photon to convert
into an electron-positron pair? (The mass of the electron and the
positron are both the mass of an electron).

It requires a photon with a minimum energy of 4.41 ✕ 10-19 J to
emit electrons from sodium metal. c) If sodium is irradiated with
light of 389 nm, what is the maximum possible kinetic energy of the
emitted electrons?(answer in J) (d) What is the maximum number of
electrons that can be freed by a burst of light (λ = 389 nm) whose
total energy is 1.20 µJ? (answer in electrons)

By using photons of specific wavelengths, chemists can
dissociate gaseous HI to produce H atoms with certain speeds. When
HI dissociates, the H atoms move away rapidly, whereas the heavier
I atoms move more slowly. (a) If a photon of 240. nm is used, what
is the excess energy (in J) over that needed for dissociation? (b)
If this excess energy is carried away by the H atom as kinetic
energy, what is its speed (in m/s)? (Bond energy of...

A photon, a packet of electromagnetic radiation, carries both
energy and momentum. Consider a photon with a wavelength of 670. nm
in vacuum. What is the frequency of the photon?
What is the energy of the photon?
What is the momentum of the photon?

What is the energy of a 480 nm blue photon?

a. what is the energy of the emitted photon if an electron in
the hydrogen atom makes a transition from the n=7 state to the n=2
state?
b. Now, Imagine there is a photon with the same wavelength. What
is the speed of this photon?

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

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