A distant galaxy emits light that has a wavelength of 596.8 nm.
On earth, the wavelength of this light is measured to be 601.9 nm.
(a) Decide whether this galaxy is approaching or receding from the
earth. (b) Find the speed of the galaxy relative to the earth.
(Give your answer to 4 significant digits. Use 2.998 × 108 m/s as
the speed of light.)
You
know that certain blackbody emits maximum radiation at 500 nm. How
will the wavelength change if you decrease the temperature of the
blackbody by 1000K? Where will the wavelength and frequency be
now?
An LED that emits light of wavelength λ = 614 nm illuminates the
phototube. A reverse bias is applied to the phototube (a voltage
that opposes the current flow). This is adjusted carefully until
the photocurrent drops to zero. The stopping potential is found to
be Vo = 0.162 V.
The LED can now be changed and the process repeated for a
different λ. Then the data can be plotted to determine Planck's
constant, h.
For the data collected above...
Blue light of wavelength 470 nm is used to illuminate a pair of
narrow slits that are 0.020 mm apart and 1.60 m from a screen.
(a) What is the angular position of the second-order minimum
(dark spot)?
(b) What is the distance on the screen between the central
maximum and the second-order
minimum?
(c) The reason there is a dark spot at this location on the
screen is because light from one slit has
to travel further than light...
A helium neon laser emits red light of wavelength 632.8 nm,
which is obtained when neon atoms move from level 5s to level 3p.
Given is a tube that contains 0.25 moles of a helium-neon mix, of
which 15% are neon atoms. Also given is that while the laser is
active, around 2% of the neon atoms are located at one of the two
given energy levels at any time.
a) what is the difference in energy between levels 5s...
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.Consider a 465 nm wavelength blue light falling on a pair of
slits separated by 0.055 mm.
A) At what angle (in degrees) is the first-order maximum for the
blue light? \
2.Suppose you have a lens system that is to be used primarily
for 690 nm red light.
B)What is the second thinnest coating of magnesium fluorite,
which has an index of refraction of n = 1.38, that would
be non-reflective for this wavelength? Assume the index of
refraction...
Blue light of wavelength 470 nm passes through an interference
grating with a slit spacing of0.001 mm and makes an interference
pattern on the wall.
How many bright fringes will be seen?
A carbon-dioxide laser emits infrared light with a wavelength of
10.6 μm. A) What is the length of a tube that will oscillate in the
m = 280000 mode? B) What is the frequency? C)Imagine a pulse of
light bouncing back and forth between the ends of the tube. How
many round trips will the pulse make in each second?
What is the wavelength (in nm) of light having a frequency of
6.8 × 1013 Hz? What is the frequency (in Hz) of light having a
wavelength of 8.53 × 102 nm? a) Wavelength of light × 10 nm (Enter
your answer in scientific notation.) b) Frequency of light × 10 Hz
(Enter your answer in scientific notation.)