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Questions and Answers
What part of speech is 'tactic'?
What part of speech is 'tactic'?
- Verb
- Noun (correct)
- Adverb
- Adjective
Which word means to 'make weak'?
Which word means to 'make weak'?
- Salient
- Perilous
- Tactic
- Enfeeble (correct)
What is a catacomb?
What is a catacomb?
- A type of cat
- A musical intrument
- An underground tunnel for burying bodies (correct)
- A kitchen implement
Which of these words is an adjective?
Which of these words is an adjective?
What type of job is a 'sinecure'?
What type of job is a 'sinecure'?
What is a squall?
What is a squall?
Which word describes being struck dumb with surprise?
Which word describes being struck dumb with surprise?
What does 'stupefaction' involve?
What does 'stupefaction' involve?
Which word describes something as 'most noticeable'?
Which word describes something as 'most noticeable'?
Which of the following word is sometimes used in a military context?
Which of the following word is sometimes used in a military context?
What is a 'tactic'?
What is a 'tactic'?
Which part of speech is the word 'enfeeble'?
Which part of speech is the word 'enfeeble'?
What is the meaning of 'perilous'?
What is the meaning of 'perilous'?
Which of these describes the job 'sinecure'?
Which of these describes the job 'sinecure'?
What does it mean to be 'dumbfounded'?
What does it mean to be 'dumbfounded'?
What part of speech can the word 'salient' be?
What part of speech can the word 'salient' be?
What action describes a 'squall'?
What action describes a 'squall'?
Which of the followings describe something as 'most noticeable'?
Which of the followings describe something as 'most noticeable'?
Flashcards
Tactic
Tactic
A plan for attaining a particular goal.
Enfeeble
Enfeeble
To make weak.
Catacomb
Catacomb
An underground tunnel with recesses where bodies are buried.
Perilous
Perilous
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Sinecure
Sinecure
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Squall
Squall
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Dumbfounded
Dumbfounded
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Stupefaction
Stupefaction
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Salient
Salient
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Study Notes
Here are the updated study notes:
- Study notes for Vocabulary 6 Definitions, English II
Tactic
- Noun
- A plan for attaining a particular goal
Enfeeble
- Verb
- To make weak
Catacomb
- Noun
- An underground tunnel with recesses where bodies were buried
Perilous
- Adjective
- Filled with danger
Sinecure
- Noun
- An office that involves minimal duties
Squall
- Verb
- To utter a sudden loud cry; make high-pitched whiney noises
Dumbfounded
- Adjective
- As if struck dumb with astonishment and surprise
Stupefaction
- Noun
- The action of making dull or lethargic, often through drunkenness or infatuation
- A feeling of stupefied astonishment
Salient
- Adjective, Noun
- Most noticeable or important
- (in military context) the part of the line of battle that projects closest to the enemy
Specific Intensity
- Energy $\delta E$ crosses area $\delta A$ in time $\delta t$ into solid angle $\delta \Omega$ about direction $\hat{n}$ in frequency range $(\nu, \nu + \delta \nu)$.
- Formula: $\delta E = I_{\nu}(\hat{n}) \delta A \delta t \delta \Omega \delta \nu$
- $I_{\nu}(\hat{n})$ is the specific intensity, also known as brightness.
- Units for specific intensity: $\text{erg s}^{-1} \text{cm}^{-2} \text{Hz}^{-1} \text{ster}^{-1}$
- $I_{\nu}$ remains constant along a ray in free space.
Flux
- Energy per time per area
- Formula: $F_{\nu} = \int I_{\nu} \cos \theta d\Omega$
- $\cos \theta = \hat{n} \cdot \hat{z}$
- If $I_{\nu}$ is isotropic, then $F_{\nu} = 0$
Astrophysical Flux
- Flux integrated over all frequencies
- Formula: $F = \int F_{\nu} d\nu$
- Units: $\text{erg s}^{-1} \text{cm}^{-2}$
Luminosity
- Total energy emitted per time
- Formula: $L = 4\pi R^2 F$
- Units: $\text{erg s}^{-1}$
Energy Density
- Energy per volume per frequency, denoted as $u_{\nu}$
- Formula: $u_{\nu} = \frac{1}{c} \int I_{\nu} d\Omega$
- For isotropic radiation: $u_{\nu} = \frac{4\pi}{c} I_{\nu}$
- Total energy density: $u = \int u_{\nu} d\nu$
Radiation Pressure
- For isotropic radiation: $P = \frac{1}{3} u$
- General case: $P_{\nu} = \frac{1}{c} \int I_{\nu} \cos^2 \theta d\Omega$
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Description
Study notes for Vocabulary 6 Definitions, English II. Covers terms like 'tactic' (a plan for attaining a particular goal) to 'salient' (most noticeable or important). Includes definitions and parts of speech.
