Get 2 FREE Instant-Explanations on Filo with code FILOAPP

Home

Physics Part-I

Electromagnetic Waves

Use the formula _mT = 0.29 cm K to obtain the characteristic t

Physics Part-I

Class 12

NCERT

Chapter 1: Electric Charges and Fields

47 questions

Chapter 2: Electrostatic Potential and Capacitance

46 questions

Chapter 3: Current Electricity

33 questions

Chapter 4: Moving Charges and Magnetism

41 questions

Chapter 5: Magnetism and Matter

36 questions

Chapter 6: Electromagnetic Induction

28 questions

Chapter 7: Alternating Current

37 questions

Chapter 8: Electromagnetic Waves

20 questions

About 5% of the power of a 100 W light bulb is converted to visible radiation. What is the average intensity of visible radiation

(a) at a distance of 1m from the bulb?

(b) at a distance of 10 m?

Assume that the radiation is emitted isotropically and neglect reflection.

Use the formula

λ_{m}

T = 0.29 cm K to obtain the characteristic temperature ranges for different parts of the electromagnetic spectrum. What do the numbers that you obtain tell you?

Given below are some famous numbers associated with electromagnetic radiations in different contexts in physics. State the part of the electromagnetic spectrum to which each belongs.

(a) 21 cm (wavelength emitted by atomic hydrogen in interstellar space).

(b) 1057 MHz (frequency of radiation arising from two close energy levels in hydrogen; known as Lamb shift).

(c) 2.7 K [temperature associated with the isotropic radiation filling all space thought to be a relic of the big-bang origin of the universe].

(d)

5890 \overset{˚}{A} - 5896 \overset{˚}{A}

[double lines of sodium]

(e) 14.4 ke V [energy of a particular transition in

^{57}

Fe nucleus associated with a famous high resolution spectroscopic method (

M \overset{o}{¨} ssbauer spectroscopy

)].

View all question

Question

Medium

Solving time: 4 mins

Use the formula $λ_{m}$ T = 0.29 cm K to obtain the characteristic temperature ranges for different parts of the electromagnetic spectrum. What do the numbers that you obtain tell you?

Views: 5,653 students

Book:

Physics Part-I (NCERT)

Found 8 tutors discussing this question

Elijah Discussed

Use the formula

λ_{m}

T = 0.29 cm K to obtain the characteristic temperature ranges for different parts of the electromagnetic spectrum. What do the numbers that you obtain tell you?

10 mins ago

Discuss this question LIVE

10 mins ago

Text solutionVerified

A body at temperature T produces a continuous spectrum of wavelengths. For a black body, the wavelength corresponding to maximum intensity of radiation is given according to Planck's law by the relation,

m = 0.29 c m K / T

. For

m = 1 0^{6} m, T = 2900 K

.Temperatures for other wavelengths can be found. These numbers tell us the temperature ranges required for obtaining radiations in different parts of the electromagnetic spectrum. Thus, to obtain visible radiation, say

= 5 \times 1 0^{7} m

, the source should have a temperature of about

6000 K

. A lower temperature will also produce this wavelength but not the maximum intensity.

Was this solution helpful?

Report

One destination for complete JEE/NEET preparation

One destination to cover all your homework and assignment needs

Learn Practice Revision Succeed

Instant 1:1 help, 24x7

60, 000+ Expert tutors

Textbook solutions

Big idea maths, McGraw-Hill Education etc

Essay review

Get expert feedback on your essay

Schedule classes

High dosage tutoring from Dedicated 3 experts

Trusted by 4 million+ students

Practice more questions from Physics Part-I (NCERT)

About 5% of the power of a 100 W light bulb is converted to visible radiation. What is the average intensity of visible radiation

(a) at a distance of 1m from the bulb?

(b) at a distance of 10 m?

Assume that the radiation is emitted isotropically and neglect reflection.

Use the formula

λ_{m}

T = 0.29 cm K to obtain the characteristic temperature ranges for different parts of the electromagnetic spectrum. What do the numbers that you obtain tell you?

Given below are some famous numbers associated with electromagnetic radiations in different contexts in physics. State the part of the electromagnetic spectrum to which each belongs.

(a) 21 cm (wavelength emitted by atomic hydrogen in interstellar space).

(b) 1057 MHz (frequency of radiation arising from two close energy levels in hydrogen; known as Lamb shift).

(c) 2.7 K [temperature associated with the isotropic radiation filling all space thought to be a relic of the big-bang origin of the universe].

(d)

5890 \overset{˚}{A} - 5896 \overset{˚}{A}

[double lines of sodium]

(e) 14.4 ke V [energy of a particular transition in

^{57}

Fe nucleus associated with a famous high resolution spectroscopic method (

M \overset{o}{¨} ssbauer spectroscopy

)].

View all

Stuck on the question or explanation?

Connect with our Physics tutors online and get step by step solution of this question.

231 students are taking LIVE classes

Question Text	Use the formula $λ_{m}$ T = 0.29 cm K to obtain the characteristic temperature ranges for different parts of the electromagnetic spectrum. What do the numbers that you obtain tell you?
Topic	Electromagnetic Waves
Subject	Physics
Class	Class 12
Answer Type	Text solution:1
Upvotes	21

Use the formula $λ_{m}$ T = 0.29 cm K to obtain the characteristic temperature ranges for different parts of the electromagnetic spectrum. What do the numbers that you obtain tell you?

Text solutionVerified

Practice more questions from Physics Part-I (NCERT)

Practice questions from Physics Part-I (NCERT)

Practice more questions from Electromagnetic Waves

Practice questions on similar concepts asked by Filo students

Use the formula λm​T = 0.29 cm K to obtain the characteristic temperature ranges for different parts of the electromagnetic spectrum. What do the numbers that you obtain tell you?

Text solutionVerified

Practice more questions from Physics Part-I (NCERT)

Practice questions from Physics Part-I (NCERT)

Practice more questions from Electromagnetic Waves

Practice questions on similar concepts asked by Filo students

Related books for questions on Electromagnetic Waves

Use the formula $λ_{m}$ T = 0.29 cm K to obtain the characteristic temperature ranges for different parts of the electromagnetic spectrum. What do the numbers that you obtain tell you?