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Physics Part-I

Electromagnetic Waves

Given below are some famous numbers associated with electromag

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

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

)].

Answer the following questions:

(a) Long distance radio broadcasts use short-wave bands. Why?

(b) It is necessary to use satellites for long distance TV transmission.Why?

(c) Optical and radiotelescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth.Why?

(d) The small ozone layer on top of the stratosphere is crucial for human survival. Why?

(e) If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now?

(f) Some scientists have predicted that a global nuclear war on the earth would be followed by a severe nuclear winter with a devastating effect on life on earth. What might be the basis of this prediction?

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Solving time: 4 mins

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 ( $M \overset{o}{¨} ssbauer spectroscopy$ )].

Uploaded: 2022-05-14T08:53:41.000Z
Duration: 15 min

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Updated on: May 14, 2022

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Physics Part-I (NCERT)

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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

)].

10 mins ago

Discuss this question LIVE

10 mins ago

Text solutionVerified

(a)

Radio waves have wavelengths of 1mm to 100km. Hence, 21cm lies at short wavelength end of radio waves.

(b)

Radio waves belong to the shortest wavelength in the electromagnetic spectrum.

(c)

$λ_{m} = 0.29/ T = 0.11 c m$

This wavelength corresponds to the microwaves.

(d)

Lines from 400nm to 700nm lies in visible range. The range of 589nm lies in Yellow part of visible spectrum.

(e)

$E = h ν$

$ν = 3.4 \times 1 0^{18} Hz$

This corresponds to the X-rays.

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Practice more questions from Physics Part-I (NCERT)

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

)].

Answer the following questions:

(a) Long distance radio broadcasts use short-wave bands. Why?

(b) It is necessary to use satellites for long distance TV transmission.Why?

(c) Optical and radiotelescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth.Why?

(d) The small ozone layer on top of the stratosphere is crucial for human survival. Why?

(e) If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now?

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Question Text	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 ( $M \overset{o}{¨} ssbauer spectroscopy$ )].
Updated On	May 14, 2022
Topic	Electromagnetic Waves
Subject	Physics
Class	Class 12
Answer Type	Text solution:1 Video solution: 2
Upvotes	331
Avg. Video Duration	8 min

Text solutionVerified

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