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Electromagnetic radiation: Wave energy
Related Topics
Wize University Chemistry Textbook > Early Atomic Theory to Quantum Theory
Wave-Particle Duality & the de Broglie Equation
4 Activities
Wize University Chemistry Textbook > Early Atomic Theory to Quantum Theory
Electromagnetic Radiation
7 Activities
A laser emits light at a wavelength of 710 nm.
What is the frequency of this light?
4.22
×
10
13
H
Z
4.22\times10^{13}H_Z
4.22
×
1
0
13
H
Z
4.22
×
10
14
H
Z
4.22\times10^{14}H_Z
4.22
×
1
0
14
H
Z
4.22
×
10
12
H
Z
4.22\times10^{12}H_Z
4.22
×
1
0
12
H
Z
4.22
×
10
11
H
Z
4.22\times10^{11}H_Z
4.22
×
1
0
11
H
Z
I don't know
Check Submission
More Wave-Particle Duality & the de Broglie Equation Questions:
Light Energy
The energy content of a particular form of light is 1.572 J per mole of photons. What is the wavelength of this light? (Choose the closest answer.)
Electromagnetic radiation: Wave energy
A laser emits light at a wavelength of 710 nm.
What is the frequency of this light?
What is the de Broglie wavelength of a 20 kg dog? (Note:
1
J
=
1
k
g
m
2
s
2
1\ J\ \ =\ 1\ kg\ \frac{m^2}{s^2}
1
J
=
1
k
g
s
2
m
2
)
If a photon was able to remove an electron from a metal plate that had a binding energy of 2 x 10
-20
J, what was the frequency of the wave?
If the answer has an exponent write it like this 1.23x10^4 (no spaces)
Light and EM Multipart Question
You have a laser that emits light at a wavelength of 710 nm.
Work Function
The work function of metallic cesium is 3.36×10
−19
J. What is the threshold wavelength of light required to emit electrons from the surface of metallic cesium?
Light Energy
The energy content of a particular form of light is 1.572 J per mole of photons. What is the wavelength of this light? (Choose the closest answer.)
H atom
A hydrogen atom, initially in its lowest energy level, absorbs a photon with a wavelength of 93.1 nm. What is the final energy level?
H-like system
Which of the following electron transitions for the hydrogen atom is associated with the longest photon wavelength?
de Broglie wavelength
Which of the following objects has the longest de Broglie wavelength? Assume they are all moving at the same speed.
Wave particle duality
The wavelike character of ordinary objects like a thrown baseball cannot be detected because:
Energy of Light
A domestic microwave generates radiation of wave length 9.3 cm (very low energy).
a. What are the energy values per photon and per mole of of photons?
b. Calculate the frequency of this radiation
Water can absorb infrared radiation at a wavelength of
1.06
×
10
4
m
{\small 1.06\times10^4 \text{ m}}
1.06
×
1
0
4
m
. If a 180 g sample of water is irradiated at this wavelength, calculate the number of photons required to raise the temperature by 25.0
°
C
(
C
H
2
O
=
4.184
J
g
°
C
)
{\small \degree \text{C} \left(C_{H_2O} =4.184\frac{J}{g\degree C} \right)}
°
C
(
C
H
2
O
=
4.184
g
°
C
J
)
Electromagnetic radiation: Wave Energy
Calculate the energy of one photon whose wavelength is 589 nm.
How heavy is a particle whose de Broglie wavelength is 1.87 x 10
-16
m?
Practice Problem 1: de Broglie Equation
What is the energy associated with the de Broglie wavelength of a 1000 kg car? (
(
1
J
=
1
k
g
m
2
s
2
)
\left(1\ J\ =\ 1kg\frac{m^2}{s^2}\right)
(
1
J
=
1
k
g
s
2
m
2
)
An emission spectrum for a one-electron species is shown below. All the lines correspond to transitions ending at the energy level n = 3. Line B has a wavelength of 165 nm. Identify the species that produced this spectrum.
Identify the species in the spectrum above
If a photon was able to remove an electron from a metal plate that had a binding energy of 2 x 10
-20
J, what was the frequency of the wave?
Wave Particle Duality: de Broglie's Postulate
Calculate the de Broglie wavelength for the following objects. For each one decide whether they are best treated as classical or quantum mechanical particles
A proton moving at 1% of the speed of light
How heavy is a particle whose de Broglie wavelength is 1.87 x 10
-16
m?
What is the de Broglie wavelength of a 20 kg dog? (Note:
1
J
=
1
k
g
m
2
s
2
1\ J\ \ =\ 1\ kg\ \frac{m^2}{s^2}
1
J
=
1
k
g
s
2
m
2
)
Wave Particle Duality and the Heisenberg Uncertainty Principle
A beam of electrons is accelerated towards a thin metal foil and diffracts to give the exact same pattern as a blue laser with wavelength of 480nm. (m
e
= 9.11 x 10
-31
kg)
a) What speed were the electrons accelerated to?'
b) If we measure the speed to a precision of ± 1% what is the minimum uncertainty in the position of the electron?
A proton (m
p
= 1.6726 x 10
-27
kg) was found to have a de Broglie wavelength of 522 nm. How fast was the particle moving?
Quantum Model: de Broglie's Equation
What is the energy associated with the de Broglie wavelength of a 1000 kg car? (
(
1
J
=
1
k
g
m
2
s
2
)
\left(1\ J\ =\ 1\ kg\frac{m^2}{s^2}\right)
(
1
J
=
1
k
g
s
2
m
2
)
Wave-Particle Duality: Wave Energy
Scientists in the lab were preparing a new chemical reaction. Upon mixing the chemicals, the reaction began to emit a great deal of light. The scientists were able to determine that each photon of light was releasing 8.32 x 10
-19
J of energy. What is the wavelength of this light? What is the frequency?
Wave Particle Duality: de Broglie's Postulate
The electrons used in electron microscopy have a velocity of 70% of the speed of light. What is their wavelength in nm?
The reason that we can't measure the position and velocity of a particle to infinite precision is?
What wavelength of light corresponds to a transition from a 6p orbital to a 1s orbital in hydrogen?
Report your answer to three significant figures in nm. Please do not include units in the answer field.
The experiment that showed electrons can behave like waves is the:
de Broglie's postulate: Wavelength of Lance Armstrong
During the tour de France in 2010, Lance Armstrong reached a speed of 57.8km/h descending one of the mountains. If we treat Lance and his bike as a single particle with a weight of 100kg what is the wavelength of Lance Armstrong?
Young's Double-Slit Experiment
If you shoot a beam of electrons at a piece of metal with two small slits in it, a diffraction pattern appears on the detector on the otherside. This is often refereed to as a two slit experiment. This result shows that,
What is the wavelength of an electron traveling at 5% the speed of light?
More Electromagnetic Radiation Questions:
Electromagnetic Radiation
A green laser pointer emits light at 532.0 nm. What is the frequency of this radiation?
Electromagnetic Radiation: Photon energy
A laser emits light at a wavelength of 710 nm.
What is the energy of a single photon from this laser?
Electromagnetic radiation: Wave energy
A laser emits light at a wavelength of 710 nm.
What is the frequency of this light?
Photon
What is the energy of a light wave with frequency of
1.04
×
10
15
H
z
1.04\times10^{15}Hz
1.04
×
1
0
15
H
z
?
Electromagnetic Radiation
As the wavelength of light decreases, which is also true of light?
Energy of Light
A UV light of frequency 2.73
⋅
\cdot
⋅
10
16
s
−
1
is ____ times _____ in energy than a yellow light of frequency 5.26
⋅
\cdot
⋅
10
14
s
−
1
Electromagnetic radiation
Which of the following wavelengths corresponds to a photon in the infrared region of
the electromagnetic spectrum?
Electromagnetic Radiation
If a photon of light has
λ
=
478
n
m
,
\lambda=478\ nm,
λ
=
478
nm
,
what is it’s wavelength in meters?
Electromagnetic Radiation
A green laser pointer emits light at 532.0 nm. What is the frequency of this radiation?
Electromagnetic Radiation
Which of the following statements are true?
i. When an electron falls to a lower energy level in an atom, it emits electromagnetic radiation.
ii. The energy of electromagnetic radiation is directly proportional to its frequency.
Electromagnetic radiation: Frequency of light
Your mean professor (in a different course) shines a red laser pointer into your eye with a wavelength of 666 nm. What is the frequency of this light?
Electromagnetic Radiation: Photon energy
A laser emits light at a wavelength of 710 nm.
What is the energy of a single photon from this laser?
A laser emits light at a wavelength of 710 nm.
What color is the laser?
Laser Emitting Photons Problem
A laser emits a light beam with a power of 5 mW. The wavelength of the light is 374 nm. How many photons per second does this laser emit? (3mW=3mJ/s)
Hint: Calculate the energy of a single photon
Power=5mW (light beam) based on conversion provided I know this is equal to 5mJ/s
wavelength=374nm -> convert to m: 1nm=1x10-9m, so 374x10-9m
Wavelength
Which of the following has the longest wavelength?
Electromagnetic Radiation
4.
Rank the following from longest wavelength to shortest wavlength: Microwaves, ultraviolet, infrared, visible light, and X-rays. (In the table, 1=longest and 5=shortest)
Electromagnetic Radiation
An organic molecule absorbs radiation that has a frequency of 2.8 x 10
15
s
-1
.
a)
What is the wavelength of radiation?
b)
What is the energy of radiation?
Electromagnetic Radiation
6.
A carbon-nitrogen bond in an organic molecule absorbs radiation that has a frequency of 4.3 x 10
12
s
-1
.
a)
What is the wavelength of radiation?
b)
What is the energy of radiation?
Electromagnetic Radiation
5.
Which of the following statements are true?
Electromagnetic radiation: Wave Energy
Calculate the energy of one photon whose wavelength is 589 nm.
Practice: Photon
What is the energy of a light wave with frequency of
1.04
×
10
15
H
z
1.04\times10^{15}Hz
1.04
×
1
0
15
H
z
?
Electromagnetic Radiation
What is the wavelength of a photon of light, which has a frequency of 2.8 x 10
14
Hz?
A photon of light has a wavelength of 700 nm. What is its frequency?
If a light wave has a wavelength of 420 nm, what is it’s frequency?
If the answer has an exponent write it like this 1.23x10^4 (no spaces)
Electromagnetic Radiation: Practice
Rank the following types of electromagnetic radiation from lowest to highest energy.
Radio Waves, Infrared Radiation, X-rays, Microwaves, Visible Light, UV Radiation
Transverse Waves
Use the graph below to answer the following questions:
1. Which wave has the lowest energy?
D
2. What is the wavelength of wave A?
200nm
Choose one of the following statements which is FALSE
An electromegnetic wave undergoes three complete oscillations over a 360 nm segment of space. What is the frequency of this wave?
Electromagnetic Radiation
Rank the following types of electromagnetic radiation from lowest to highest energy.
Radio Waves, Infrared Radiation, X-rays, Microwaves, Visible Light, UV Radiation
Electromagnetic Radiation: Energy
A photon has wavelength of 2.0 cm in space. What is its energy?
Electromagnetic Radiation: Energy of Blue Laser Pointers
An argon ion laser produces a blue laser beam with a wavelength of 458 nm. What is the energy of this light expressed in kJ/mol?
What is the wavelength of a an electromagnetic wave with a frequency of 3.78 x 10
15
s
-1
?