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Physics Part-I

Electromagnetic Waves

About 5% of the power of a 100 W light bulb is converted to vi

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

Suppose that the electric field part of an electromagnetic wave in vacuum is

E = (3.1 N / C) cos [(1.8 r a d / m) y + (5.4 \times 1 0^{6} r a d / s) t] \hat{i}

(a) What is the direction of propagation?
(b) What is the wavelength

λ

?
(c) What is the frequency v?
(d) What is the amplitude of the magnetic field part of the wave?
(e) Write an expression for the magnetic field part of the wave.

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?

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Solving time: 4 mins

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.

Name: Video solution 1: [Solved] 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. - Physics Part-I
Uploaded: 2022-05-14T08:53:41.000Z
Duration: 15 min
Description: Video solution 1: [Solved] 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. - Physics Part-I

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Updated on: May 14, 2022

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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.

8 mins ago

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8 mins ago

Text solutionVerified

(a)

Power of visible radiation

P^{^{'}} = 5 \times 100/100 = 5 W

I = P^{^{'}} /4 π d^{2} = 0.398 W / m^{2}; d = 1 m

(b)

Power of visible radiation $P^{^{'}} = 5 \times 100/100 = 5 W$

$I = P^{^{'}} /4 π d^{2} = 0.004 W / m^{2}; d = 10 m$

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Practice more questions from Physics Part-I (NCERT)

Suppose that the electric field part of an electromagnetic wave in vacuum is

E = (3.1 N / C) cos [(1.8 r a d / m) y + (5.4 \times 1 0^{6} r a d / s) t] \hat{i}

(a) What is the direction of propagation?
(b) What is the wavelength

λ

?
(c) What is the frequency v?
(d) What is the amplitude of the magnetic field part of the wave?
(e) Write an expression for the magnetic field part of the wave.

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?

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Question Text	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.
Updated On	May 14, 2022
Topic	Electromagnetic Waves
Subject	Physics
Class	Class 12
Answer Type	Text solution:1 Video solution: 2
Upvotes	321
Avg. Video Duration	8 min

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.

Text solutionVerified

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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.

Text solutionVerified

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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.