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If an electromagnetic wave of frequency \(f= 3\) MHz passes from vacuum into a dielectric medium with relative permittivity \(K = 4.0\), then:
1.
wavelength is \(2\) times and frequency becomes half.
2.
wavelength is half and frequency remains unchanged.
3.
wavelength and frequency both remain unchanged.
4.
None of the above.
Subtopic: Properties of EM Waves |
75%
Level 2: 60%+
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The most penetrating radiation out of the following is:
1. \(X\text-\)rays
2. \(\beta\text-\)rays
3. \(\alpha\text-\)rays
4. \(\gamma\text-\)rays
Subtopic: Electromagnetic Spectrum |
82%
Level 1: 80%+
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Which of the following statements is false regarding the properties of electromagnetic waves?
| 1. | Both electric and magnetic field vectors attain the maxima and minima at the same place and the same time |
| 2. | The energy in an electromagnetic wave is divided equally between electric and magnetic vectors |
| 3. | Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of the wave |
| 4. | These waves do not require any material medium for propagation |
Subtopic: Properties of EM Waves |
87%
Level 1: 80%+
NEET - 2010
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In an electromagnetic wave, energy density associated with a magnetic field will be:
| 1. | 2. | ||
| 3. | 4. |
|
Subtopic: Properties of EM Waves |
86%
Level 1: 80%+
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Light is a kind of wave. The wavelength of visible light ranges from about \(4000~\mathring{A}\) to \(7000~\mathring{A}\). Which of the following statements is false?
| 1. | Ultraviolet light has a wavelength shorter than \(4000~\mathring{A}\). |
| 2. | Infrared light has a wavelength longer than \(7000~\mathring{A}\). |
| 3. | Red light has a wavelength near about \(7000~\mathring{A}\). |
| 4. | Violet light has a wavelength near about \(7000~\mathring{A}\). |
Subtopic: Electromagnetic Spectrum |
76%
Level 2: 60%+
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If a source is transmitting an electromagnetic wave of frequency \(8.2\times 10^{6}~\text{Hz}\), then the wavelength of the electromagnetic wave transmitted from the source will be:
| 1. | \(36.6\) m | 2. | \(40.5\) m |
| 3. | \(42.3\) m | 4. | \(50.9\) m |
Subtopic: Generation of EM Waves |
88%
Level 1: 80%+
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Given below are two statements:
| Assertion (A): | Light can travel in vacuum but sound cannot do so. |
| Reason (R): | Light is an electromagnetic wave and sound is a mechanical wave. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Properties of EM Waves |
84%
Level 1: 80%+
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Instantaneous displacement current of \(2.0~\text A\) is set up in the space between two parallel plates of \(1~\mu \text{F}\) capacitor. The rate of change in potential difference across the capacitor is:
1. \(3\times 10^{6}~\text{V/s}\)
2. \(4\times 10^{6}~\text{V/s}\)
3. \(2\times 10^{6}~\text{V/s}\)
4. None of these
Subtopic: Displacement Current |
89%
Level 1: 80%+
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A variable frequency AC source is connected to a capacitor. Then on increasing the frequency:
| 1. | Both conduction current and displacement current will increase |
| 2. | Both conduction current and displacement current will decrease |
| 3. | Conduction current will increase and displacement current will decrease |
| 4. | Conduction current will decrease and displacement current will increase |
Subtopic: Displacement Current |
74%
Level 2: 60%+
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Consider an electric charge oscillating with a frequency of \(10\) MHz. The radiation emitted will have a wavelength equal to:
| 1. | \(20\) m | 2. | \(30\) m |
| 3. | \(40\) m | 4. | \(10\) m |
Subtopic: Properties of EM Waves |
89%
Level 1: 80%+
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