menu
bartleby
search
close search
Hit Return to see all results

Townsend 1.21: A certain photodetector can resolve the time of arrival of a photon to within2.108 s. Two of these detectors are used in an anticoincidence experiment, as described inSection 1.4.a. What is the maximum average rate of photon emission from the source if there is anyhope of demonstrating anticoincidence?b.Assuming the source emits light of wavelength 550 nm, what is the power output of thesource? PM,CoincidenceGateScounterРM,-WFigure 1.20 A schematic diagram of the anticoincidence experiment of Grangier et alThe source S emits two photons in a cascade decay. Detection of the first photon is usedto generate an electrical pulse which activates the two photomultipliers.

Question
Townsend 1.21: A certain photodetector can resolve the time of arrival of a photon to within
2.
108 s. Two of these detectors are used in an anticoincidence experiment, as described in
Section 1.4.
a. What is the maximum average rate of photon emission from the source if there is any
hope of demonstrating anticoincidence?
b.
Assuming the source emits light of wavelength 550 nm, what is the power output of the
source?
help_outline

Image Transcriptionclose

Townsend 1.21: A certain photodetector can resolve the time of arrival of a photon to within 2. 108 s. Two of these detectors are used in an anticoincidence experiment, as described in Section 1.4. a. What is the maximum average rate of photon emission from the source if there is any hope of demonstrating anticoincidence? b. Assuming the source emits light of wavelength 550 nm, what is the power output of the source?

fullscreen
PM,
Coincidence
Gate
S
counter
РM,
-W
Figure 1.20 A schematic diagram of the anticoincidence experiment of Grangier et al
The source S emits two photons in a cascade decay. Detection of the first photon is used
to generate an electrical pulse which activates the two photomultipliers.
help_outline

Image Transcriptionclose

PM, Coincidence Gate S counter РM, -W Figure 1.20 A schematic diagram of the anticoincidence experiment of Grangier et al The source S emits two photons in a cascade decay. Detection of the first photon is used to generate an electrical pulse which activates the two photomultipliers.

fullscreen
check_circleAnswer
Step 1

In an anticoincidence experiment, only one of the detectors should receive a signal within a period of 10-8 s. If both or any one of them receive two photons within 10-8 s, then the signal will get rejected. So, the sources should not emit photons faster than one photon in 10-8 s, or 108 photons per second.

Step 2

(a) The maximum rate of photon emission from the source is 108 photons per second.

Step 3

(b) The energy of t...

hc
E =
(6.626x10 J.s)(3x10 m/s2)
550 nm10m
nm
= 3.61x1019J
leV
E(in eV) 3.61x10"1" Jx
1.6x 10-19 J
=2.26eV
help_outline

Image Transcriptionclose

hc E = (6.626x10 J.s)(3x10 m/s2) 550 nm10m nm = 3.61x1019J leV E(in eV) 3.61x10"1" Jx 1.6x 10-19 J =2.26eV

fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Our solutions are written by experts, many with advanced degrees, and available 24/7

See Solution
Tagged in

Science

Physics

Work,Power and Energy

Related Physics Q&A

Find answers to questions asked by student like you

Show more Q&A add
question_answer

Q: 9d. Consider the motion of a ball thrown vertically upward. Use a vertical y-axis with the positive ...

A: The ball is thrown vertically upwards with positive Y axis pointing up. According to the newton’s se...

question_answer

Q: An object on the ground is launched at 35ˍm/s at an angle of 61° above the horizontal. If the object...

A: Consider u (35 m/s) be the initial velocity of the object and the initial velocity makes an angle θ ...

question_answer

Q: Ultrasound probes can resolve structural details with sizes approximately equal to the wavelength of...

A: Click to see the answer

question_answer

Q: What is the gain in potential energy of the load?

A: Potential energy is the energy possessed by a body by virtue of its position. Suppose a load is rais...

question_answer

Q: A 1440-kg submarine rises straight up towards the surface. Seawater exerts both an upward buoyant fo...

A: Given:Mass of the submarine = 1440 kgBuoyant force in upward direction = 16870 NResistive force by t...

question_answer

Q: 1. Townsend 1.8: A helium-neon laser (-633 nm) used in a lecture demonstration of the double- slit e...

A: Write the expression for power emitted by the laser , and substitute 5mW for P, 633nm for λ, 3×108m/...

question_answer

Q: Explain why the temperature at the equator is always hot and the temperature at the poles is always ...

A: The Earth's axis is tilted approximately 23.5° from vertical. This axis tilt means that during the E...

question_answer

Q: Jane and Bob see each other when 100 m apart. They are moving toward each other, Jane at speed 3.6m/...

A: Click to see the answer

question_answer

Q: Can you please do question #8? Thank you.

A: In the case of static friction and kinetic friction, the frictional force is does not depend up on t...

Sorry about that. What wasn’t helpful?