Calculate the rate of energy emitted from an
incandescent tungsten halogen light bulb as a function of
wavelength (W/m2 per µm versus wavelength in µm). Assume the
tungsten filament has a temperature of 3300 K.
c. What fraction of the total energy emitted by the bulb
produces light that we can see and what fraction is wasted as heat
(λ > 800 nm)?
d. Compare total area under your emissive power plot to
theoretical area. Given the total power emitted...
Carbon absorbs energy at a wavelength of 150. nm. The total
amount of energy emitted by a carbon sample is 1.00 x 10^5 J.
Calculate the number of carbon atoms present in the sample,
assuming that each atom emits one photon.
Be sure to answer all parts.
Calculate the wavelength (in nm) of light with energy 1.89
×10−20 J per photon.
..............nm
For light of wavelength 460 nm, calculate the number of photons per
joule.
.........× 10^...... ( photons/J Enter your answer in
scientific notation.)
Determine the binding energy (in eV) of a metal if the kinetic
energy possessed by an ejected electron (using one of the photons
with wavelength 460 nm) is 2.58 ×10−19 J.
.............. eV
The emission wavelength lies between 275 nm and 450 nm and the
light yield per neutron is reported to be 20000 photons/MeV neutron
energy
(a) What largest work function of a material used for a photo
cathode would be acceptable that still allows detection of an
emission originating from the scintillator?
(b) What is the maximum kinetic energy of electrons emitted from
the photo cathode, given the emission wavelength range of the
scintillator?
(c) How much charge is being generated...
A black light produces UV light with wavelengths below 400 nm. When the chemical quinine (which is in tonic water) is exposed to light with a wavelength of 383 nm, it becomes excited and then re-emits light at 450. nm.
Is the re-emitted light lower or higher energy than the light that was absorbed? Is it lower or higher frequency? Answer this question without a calculation.
What is the energy of a single photon of the UV light that was...
A photoelectric experiment was performed by separately shining a
laser at 450 nm (blue light) and a laser at 560 nm (yellow light)
on a clean metal surface and measuring the number and kinetic
energy of the ejected electrons. Which light would generate more
electrons? Which light would eject electrons with greater kinetic
energy? Assume that the same number of photons is delivered to the
metal surface by each laser and that the frequencies of the laser
lights exceed the...
Consider the following:
(i) blue light of wavelength 450 nm, traveling through water
(ii) yellow light of wavelength 580 nm, traveling through
air
(iii) red light of wavelength 670 nm, traveling through
glass
a) Calculate the speeds of each color of light in their
respective mediums.
b) Rank from slowest-to-fastest these colors of light in their
respective mediums.
c) Rank from slowest-to-fastest these colors of light in
vacuum.
1.
A) Calculate the wavelength of maximum energy emission and the
total energy emitted each of the following objects: a) A tree, with
a surface temperature of 18 oC and an emissivity 0.98 (2); b) A
lake, with a surface temperature of 10 oC and an emissivity of
0.98(2).
B) Calculate the surface temperature of the following objects
with a wavelength of maximum energy emission of: a) 10
micrometers(1); b) 500 nanometers (1).
C) Calculate the surface temperature of the...
Calculate the energy of the emitted photon as well as the
wavelength and frequency of electromagnetic radiation emitted from
the hydrogen atom when the electron undergoes the transition from n
= 5 to n = 4.