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Q. No.An electromagnetic waveform whose electric field is given by:
\(\vec E=(2\times10^{-4}\text{ V/m})\hat j\sin\bigg({\large\frac{2\pi}{0.2~\text m}}\bigg)(x-2\times10^8~\text{m/s }t)\)
is travelling in a region.
When this wave travels into vacuum, its wavelength will be:
\(\vec E=(2\times10^{-4}\text{ V/m})\hat j\sin\bigg({\large\frac{2\pi}{0.2~\text m}}\bigg)(x-2\times10^8~\text{m/s }t)\)
is travelling in a region.
When this wave travels into vacuum, its wavelength will be:
| 1. | \(0.2~\text{m}\) | 2. | \(0.3~\text{m}\) |
| 3. | \(0.1~\text{m}\) | 4. | \(0.15~\text{m}\) |
Subtopic: Â Properties of EM Waves |
From NCERT
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The orange colour of a carrot is due to the presence of the \(\beta\)-carotene molecule. This means that the \(\beta\)-carotene molecule absorbs light at wavelengths that are:
1. longer than \(550~\text{nm}\)
2. shorter than \(550~\text{nm}\)
3. longer than \(700~\text{nm}\)
4. shorter than \(700~\text{nm}\)
Subtopic: Â Electromagnetic Spectrum |
From NCERT
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Given below are two statements:
| Assertion (A): | The fastest speed of propagation of any wave in any medium is the speed of electromagnetic waves in that medium. |
| Reason (R): | All signals can at most travel at the speed of light in a vacuum. |
| 1. | (A) is True but (R) is False. |
| 2. | (A) is False but (R) is True. |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
Subtopic: Â Properties of EM Waves |
From NCERT
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The electric field of an electromagnetic wave is given by \(\overrightarrow E = E_0 \hat j \cos (\omega t - kx)+ E_0\hat i \sin (\omega t -kx)\).
The maximum value of the electric field in the wave is:
The maximum value of the electric field in the wave is:
| 1. | \(\dfrac {E_0} {\sqrt 2}\) | 2. | \(E_0\) |
| 3. | \(\sqrt 2 E_0\) | 4. | \(\sqrt 3 E_0\) |
Subtopic: Â Properties of EM Waves |
From NCERT
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An incident light beam of power \(P\) falls on a flat surface, at an angle of incidence of \(60^{\circ}.\) \(50\%\) of the beam is absorbed and the remaining reflected. The force exerted on the surface is:
| 1. | \(\dfrac{P}{c}\) | 2. | \(\dfrac{P}{2c}\) |
| 3. | \(\dfrac{\sqrt3P}{c}\) | 4. | \(\dfrac{\sqrt3P}{2c}\) |
Subtopic: Â Properties of EM Waves |
From NCERT
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A positively charged particle is placed on the \(x\text-\)axis in the path of an electromagnetic wave propagating along the \(x\text-\)axis, with its electric field oscillating along the \(y\text-\)axis. The charged particle will begin to move along:
| 1. | the electric field. |
| 2. | the magnetic field. |
| 3. | the direction of propagation. |
| 4. | the direction between the electric field and the magnetic field. |
Subtopic: Â Properties of EM Waves |
From NCERT
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A plane electromagnetic wave is given by its electric field: \(\vec {E}=\vec {E_0}\cos\dfrac{\omega}{c}(ct-\beta x)\)
where \(\omega\) and \(\beta\) are constants, \(t\) is the time and \(x\) represents the \(x\text-\)coordinate. \(c\) is the speed of the light in vacuum.
The value of \(\beta,\)
where \(\omega\) and \(\beta\) are constants, \(t\) is the time and \(x\) represents the \(x\text-\)coordinate. \(c\) is the speed of the light in vacuum.
The value of \(\beta,\)
| 1. | cannot be less than \(1\). |
| 2. | equals \(1\), always. |
| 3. | cannot be greater than \(1\). |
| 4. | can be any non-zero value. |
Subtopic: Â Properties of EM Waves |
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The magnetic field in a plane electromagnetic wave is given by;
\(B=2\times10^{-7} \sin\left(0.5\times10^3x+10^{11}t\right)~\text{T}.\)
The electromagnetic wave is:
\(B=2\times10^{-7} \sin\left(0.5\times10^3x+10^{11}t\right)~\text{T}.\)
The electromagnetic wave is:
| 1. | visible light | 2. | infrared |
| 3. | microwave | 4. | radio wave |
Subtopic: Â Electromagnetic Spectrum |
From NCERT
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Two perfectly black bodies of the same diameter, a sphere, and a disc, are placed in front of a uniform beam of light. The plane of the disc is perpendicular to the light rays. The force acting upon them by the light is:
| 1. | zero. |
| 2. | bigger on the disc. |
| 3. | bigger on the sphere. |
| 4. | the same on both. |
Subtopic: Â Properties of EM Waves |
From NCERT
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A plane electromagnetic wave, propagating along the \(x\text-\)axis, has a magnetic field given by \(\vec {B} = B_0 (\hat j + \hat k) \sin (\omega t - kx)\).
The wave is polarised along:
The wave is polarised along:
| 1. | \(\hat j\) | 2. | \(\hat k\) |
| 3. | \(\hat j + \hat k\) | 4. | \(\hat j - \hat k\) |
Subtopic: Â Properties of EM Waves |
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