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A plane electromagnetic wave travels in vacuum along z-directi
Physics Part-I
Physics Part-I

Class 12

NCERT

Publisher:
NCERT
Subject:
Physics
1

Chapter 1: Electric Charges and Fields

47 questions

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2

Chapter 2: Electrostatic Potential and Capacitance

46 questions

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3

Chapter 3: Current Electricity

33 questions

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4

Chapter 4: Moving Charges and Magnetism

41 questions

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5

Chapter 5: Magnetism and Matter

36 questions

arrow
6

Chapter 6: Electromagnetic Induction

28 questions

arrow
7

Chapter 7: Alternating Current

37 questions

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8

Chapter 8: Electromagnetic Waves

20 questions

Q1
What physical quantity is the same for X-rays of wavelength , red light of wavelength 6800 and radiowaves of wavelength 500m?
Q2
A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is 30 MHz, what is its wavelength?
Q3
A radio can tune in to any station in the 7.5 MHz to 12 MHz band. What is the corresponding wavelength band?
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Question
Easy
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Solving time: 3 mins

A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is 30 MHz, what is its wavelength?

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Updated on: May 17, 2022

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Physics Part-I (NCERT)

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A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is 30 MHz, what is its wavelength?
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Wave travel along z-direction.
Electric and magnetic field are in XY plane and perpendicular to each other.
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Practice more questions from Physics Part-I (NCERT)

Q1
What physical quantity is the same for X-rays of wavelength , red light of wavelength 6800 and radiowaves of wavelength 500m?
Q2
A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is 30 MHz, what is its wavelength?
Q3
A radio can tune in to any station in the 7.5 MHz to 12 MHz band. What is the corresponding wavelength band?
View all

Practice questions from Physics Part-I (NCERT)

Question 1
Medium
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A parallel plate capacitor (Fig.) made of circular plates each of radius R = 6.0 cm has a capacitance C = 100 pF. The capacitor is connected to a 230 V ac supply with a (angular) frequency of 300 rad .
(a) What is the rms value of the conduction current?
(b)Is the conduction current equal to the displacement current?
(c)Determine the amplitude of B at a point 3.0 cm from the axis between the plates.


Topic

Topic:

Electromagnetic Waves

Book

Book:

Physics Part-I (NCERT)

View 5 solutions

Question 2
Medium
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In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of and amplitude .
(a) What is the wavelength of the wave?
(b) What is the amplitude of the oscillating magnetic field?
(c) Show that the average energy density of the E field equals the average energy density of the B field. [c = 3 ]
Topic

Topic:

Electromagnetic Waves

Book

Book:

Physics Part-I (NCERT)

View 3 solutions

Question 3
Medium
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Views: 6,394

Figure shows a capacitor made of two circular plates each of radius 12 cm, and separated by 5.0 cm. The capacitor is being charged by an external source (not shown in the figure). The charging current is constant and equal to 0.15A.
(a) Calculate the capacitance and the rate of change of potential difference between the plates.
(b)Obtain the displacement current across the plates.
(c)Is Kirchhoffs first rule (junction rule) valid at each plate of the capacitor Explain.
Topic

Topic:

Electromagnetic Waves

Book

Book:

Physics Part-I (NCERT)

View 5 solutions

Question 4
Medium
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Views: 6,125

The terology of different parts of the electromagnetic spectrum is given in the text. Use the formula (for energy of a quantum of radiation: photon) and obtain the photon energy in units of eV for different parts of the electromagnetic spectrum. In what way are the different scales of photon energies that you obtain related to the sources of electromagnetic radiation?
Topic

Topic:

Electromagnetic Waves

Book

Book:

Physics Part-I (NCERT)

View 2 solutions

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Practice more questions from Electromagnetic Waves

Question 1
Easy
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Write one use of the electromagnetic waves of frequency range from to .
Topic

Topic:

Electromagnetic Waves

Exam

Exam:

Class 12th Board 2020

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Question 2
Easy
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A compass needle is placed in the gap of a parallel plate capacitor. The capacitor is connected to a battery through a resistance. The compass needle:
  1. Does not deflect
  2. Deflects for a very short time and then comes back to the original position
  3. Deflects and remains deflected as long as the battery is connected
  4. Deflects and gradually comes to the original position in a time which is large compared to the time constant
Topic

Topic:

Electromagnetic Waves

Book

Book:

Concepts of Physics (HC Verma Part II)

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Question 3
Easy
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Views: 5,517

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is:
  1. The frequency of the microwaves must match the resonant frequency of the water molecules
  2. The frequency of the microwaves has no relation with natural frequency of water molecules
  3. Microwaves are heat waves, so always produce heating
  4. Infra-red waves produce heating in a microwave oven
Topic

Topic:

Electromagnetic Waves

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Question 4
Easy
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A capacitor is connected to an alternating-current source. Is there a magnetic field between the plates?
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Topic:

Electromagnetic Waves

Book

Book:

Concepts of Physics (HC Verma Part II)

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प्रा. मोटेगावकर सरांचे HORIZONTAL CIRCULAR MOTION 1. A fly wheel is rotating about its own axis at an in revolution per minute is
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Solution : Since internal energy is a state function so the change in internal energy during the process will be same as that during the total process plus . Calculate the total work s during plus and total heat during these processes. Then calculate During the process the volume doesn't change so work done is zero. During the pressure is constant, so total work done \[ \begin{array}{l} =P_{B}\left(V_{C}-V_{B}\right)=P_{B}\left(V_{C}-V_{A}\right) \quad \because V_{B}=V_{A} \\ =8 \times 10^{4}\left[\mathrm{~N} / \mathrm{m}^{2}\right]\left(5 \times 10^{-3} \mathrm{~m}^{3}-2 \times 10^{-3} \mathrm{~m}^{3}\right)=240 \mathrm{~J} \end{array} \] during process plus Now given during the same total process . Example 13: Heat is supplied at constant pressure to diatomic gas. The part of this heat which goes to increase its intermal energy will be
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Question 4
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HW2-F7 HF molecule, hydrogen fluoride 12 points. From http://webbook.nist.gov, you can find the data as follows (under Constants of Diatomic molecules): = 4138.32 cm, R = 0.91680 Ã…. Useful formulas and conversion factors: wavenumber frequency 1 Ã…^-1 = 10^10 m, c = 3.10^8 m/s, h = 6.626 x 10^-34 J.s, N = 6.022 x 10^23 mol. Rotational energy. Vibrational energy, Ehvv + 1/2. Convert wavenumber, 0 to frequency, v in units. 2. Calculate reduced mass (in kg, A). 3. Momentum of inertia, I in kg.m^2 units. Rotational energy levels: EEE in Joules and energy separation: E - Eo, E - E. Are energy levels equally spaced? (yes/no)
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Question Text
A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is 30 MHz, what is its wavelength?
Updated OnMay 17, 2022
TopicElectromagnetic Waves
SubjectPhysics
ClassClass 12
Answer TypeText solution:1 Video solution: 6
Upvotes727
Avg. Video Duration7 min