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Q. No.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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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 |
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Level 1: 80%+
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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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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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