Recent Lessons

Show all results for ""

Feature Overview

Ace your exams with our all-in-one platform for creating and sharing quizzes and tests.

Quizzes

Create quizzes and tests automatically from your content using AI.

Flashcards

Automatically turn your notes into digital flashcards.

Share, Export & Embed

Share with classmates or export to Excel and your learning management system.

Stats & Reporting

Auto-grading quizzes and tests with detailed stats and reports.

Mobile Apps

The smarter way to study – wherever you are.

Pricing

Search...

Quantum Detectors: Detectors Based on Photoelectric Method

12 Questions

0 Views

Quantum Detectors: Detectors Based on Photoelectric Method

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What characteristic of quantum detectors is wavelength dependent?

Quantum efficiency

Response time

Noise equivalent power

Responsivity (correct)

How is the quantum efficiency of photoemissive detectors calculated?

Dividing radiation sensitivity by wavelength

Using percentage of area covered by the detector

Multiplying current by wavelength

By dividing detector area by the radiation sensitivity (correct)

What does the Response Time of a detector indicate?

Time taken to cool down the detector

Time taken to turn on the detector

Time taken to reach maximum sensitivity

Time taken to reach 63% of its final value (correct)

What does Noise Equivalent Power (NEP) measure?

Minimum detectable power Signup and view all the answers

Which type of quantum detector includes Vacuum Photodiode and Photomultipliers?

Photoemissive detectors Signup and view all the answers

How is Quantum Efficiency expressed?

as a percentage Signup and view all the answers

What is the maximum kinetic energy of a photoelectron ejected from a photocathode?

$(K.E)_{max} = h u - \" \phi$ Signup and view all the answers

What is the relationship between Detectivity (D) and NEP?

$D = NEP^{-1}$ Signup and view all the answers

What is the minimum frequency required to cause photoelectric emission?

threshold frequency ($\nu_c$) Signup and view all the answers

What is the formula for normalized detectivity (D*)?

$D^* = D \cdot A^{1/2} \cdot \" \Delta f^{-1/2}$ Signup and view all the answers

What is the threshold frequency for photoelectric emission in a photocathode made of alkali materials?

less than 1.2 \mu m Signup and view all the answers

What is the measurement units of normalized detectivity (D*)?

cm Hz1/2/W Signup and view all the answers