Question

An ultraviolet photon has energy of 6.63x10^{-19} J.
Find the wavelength of the UV light. Use E=hc/λ with h= 6.63 x
10^{-34} J sec and c=3x10^{8} m/s. What are some
appliances/equipment that use the uv light?

Answer #1

here,

let the wavelength of UV ray be lamda

the energy of UV ray , E = h * c /lamda

6.63 * 10^-19 = 6.62 * 10^-34 * 3 * 10^8 /lamda

lamda = 2.99 * 10^-7 m

the wavelength of UV ray is 2.99 * 10^-7 m

the appliances that use the UV light :

a)

Many hospitals safely and easily use UV lamps for sterilizing surgical equipment as well as the air in operating rooms.

b)

UV lamps also provide a safe, efficient way to treat water without the need to use harmful chemicals that create pollution in rivers

Find the wavelength (in nm) of a photon whose energy is 6.70 ×
10-19 J.
The maximum wavelength that an electromagnetic wave can have and
still eject electrons from a metal surface is 507 nm. What is the
work function W0 of this metal? Express your
answer in electron volts.
In the Compton effect, an X-ray photon of wavelength 0.16 nm is
incident on a stationary electron. Upon collision with the
electron, the scattered X-ray photon continues to travel in...

When ultraviolet light with a wavelength of 400 nmfalls on a
certain metal surface, the maximum kinetic energy of the emitted
photoelectrons is 1.10 eV .
What is the maximum kinetic energy K0 of the
photoelectrons when light of wavelength 350 nm falls on the same
surface?
Use h = 6.63×10?34 J?s for Planck's constant
and c = 3.00×108 m/s for the speed of light and
express your answer in electron volts.

When ultraviolet light with a wavelength of 400 nm falls on a
certain metal surface, the maximum kinetic energy of the emitted
photoelectrons is 1.10 eV .
What is the maximum kinetic energy K_0 of the photoelectrons
when light of wavelength 340 nm falls on the same surface?
Use h = 6.63×10−34 J⋅s for Planck's constant and c =
3.00×108 m/s for the speed of light and express your
answer in electron volts.
View Available Hint(s)
K_0 =
eV

When ultraviolet light with a wavelength of 400 nmnm falls on a
certain metal surface, the maximum kinetic energy of the emitted
photoelectrons is 1.10 eVeV .
What is the maximum kinetic energy K0K0K_0 of the
photoelectrons when light of wavelength 270 nmnm falls on the same
surface?
Use hhh = 6.63×10−34 J⋅sJ⋅s for Planck's constant and
ccc = 3.00×108 m/sm/s for the speed of light and express
your answer in electron volts.

The particle nature of light was first proposed by Albert
Einstein, who suggested that light could be described as a stream
of particles called photons. A photon of wavelength λ has
an energy (E) given by the following equation:
E=hc/λ , where E is
the energy of the photon in J, h is Planck's constant
(6.626×10−34J⋅s), and c is the speed of light
(3.00×108m/s).
Calculate the energy of 1mol of photons with a wavelength of
602nm. (answer in Joules please)

An excited hydrogen atom emits light with a wavelength of 397.2
nm to reach the
energy level for which n = 2. In which principal quantum level did
the electron
begin? (c = 3.00 x 108 m/s, h = 6.63 x 10-34 J•s, RH = 2.18 x
10-18J).

When ultraviolet light with a wavelength of 400 nm falls on a
certain metal surface, the maximum kinetic energy of the emitted
photoelectrons is 1.10 eV .
What is the maximum kinetic energy K0 of the
photoelectrons when light of wavelength 330 nm falls on the same
surface?
Use h =
6.63×10?34J?s for Planck's constant and
c =
3.00×108m/s for the speed of light and
express your answer in electron volts.

An X-Ray photon with an energy of E = 128 keV undergoes Compton
Scattering at an angle of θ = 33°. What is the wavelength
(λ0) of the incident photon (in nm)? Use h = 4.136 x
10-15 eVs and c = 3 x 108 m/s.
What is the wavelength (λ') of the scattered photon (in nm)?
What is the energy (E’) if the scattered photon (in keV)? Use h
= 4.136 x 10-15 eVs and c = 3 x...

What is the frequency f in Hz of light that has
wavelength 157 nm? (Use
1 eV = 1.602 ✕ 10−19 J,
e = 1.602 ✕ 10−19 C,
c = 2.998 ✕ 108 m/s,
and
h = 6.626 ✕ 10−34 J · s = 4.136 ✕
10−15 eV · s
as necessary.)

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...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 31 minutes ago

asked 39 minutes ago

asked 48 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago