The region on the left of the \(y\)-axis \((x<0)\) represents vacuum, and the region on the right \((x>0)\) represents a transparent medium. An electromagnetic wave travelling along the \(x\)-axis given by:    \(\vec E_1(x,t)=E_1\hat j~sin(\omega t-k_0x),\) where \(x<0,\)
is incident on to the medium on the right. The transmitted wave in the medium is:    \(\vec E_2(x,t)=E_2\hat j~sin(\omega t-2k_0x),\) where \(x>0.\)
The refractive index of the medium is:
                   
1. \(2\)
2. \(\sqrt2\)
3. \(4\)
4. \(2\sqrt2\)

Subtopic:  Properties of EM Waves |
 63%
From NCERT
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Match List - I with List - II.
List -I (Electromagnetic waves) List - II (Wavelength)
(a) AM radio waves (i) \(10^{-10}~\text{m}\)
(b) Microwaves (ii) \(10^{2} ~\text{m}\)
(c) Infrared radiation (iii) \(10^{-2} ~\text{m}\)
(d) \(X\)-rays (iv) \(10^{-4} ~\text{m}\)

Choose the correct answer from the options given below:
(a) (b) (c) (d)
1. (ii) (iii) (iv) (i)
2. (iv) (iii) (ii) (i)
3. (iii) (ii) (i) (iv)
4. (iii) (iv) (ii) (i)
Subtopic:  Electromagnetic Spectrum |
 71%
From NCERT
NEET - 2022
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Assertion: Like light radiation, thermal radiations are also electromagnetic radiation.
Reason: The thermal radiations require no medium for propagation.
1. Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
2. Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
3. Assertion is true but Reason is false.
4. Both Assertion and Reason are false.

 
Subtopic:  Properties of EM Waves |
From NCERT
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Given below are two statements:
Assertion (A): Displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor does not change.
Reason (R): The displacement current arises in the region in which the electric field and hence the electric flux does not change with time.

In light of the above statements choose the correct answer from the options given below:
 
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. Both (A) and (R) are false.
Subtopic:  Displacement Current |
 62%
From NCERT
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Assertion: If the earth did not have an atmosphere, its average surface temperature would be lower than what is now.
Reason: Greenhouse effect of the atmosphere would be absent if the earth did not have an atmosphere.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Both assertion and reason are false.

 
Subtopic:  Properties of EM Waves |
 77%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
 
Assertion (A): The energy of X-ray photons is greater than that of light photons.
Reason (R): X-ray photon in a vacuum travels faster than light photon.

In the light of the above statements choose the correct answer from the options given below:
 
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. Both (A) and (R) are false.
Subtopic:  Electromagnetic Spectrum |
 59%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
 
Assertion (A): For cooking in a microwave oven, food is always kept in metal containers.
Reason (R): The energy of the microwave is easily transferred to the food in a metal container.

In the light of the above statements choose the correct answer from the options given below:
 
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. Both (A) and (R) are false.
Subtopic:  Electromagnetic Spectrum |
From NCERT
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Given below are two statements: 
Statement I: Electromagnetic waves are radiated when a charged particle undergoes SHM.
Statement II: Electromagnetic waves propagate energy in the direction of the electric field of the wave.
 
1. Statement I is incorrect and Statement II is correct.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is correct and Statement II is incorrect.
Subtopic:  Generation of EM Waves |
 57%
From NCERT
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Assertion: Environmental damage has increased the amount of ozone in the atmosphere.
Reason: The increase of ozone increases the amount of ultraviolet radiation on earth.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Both assertion and reason are false.
Subtopic:  Properties of EM Waves |
 68%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
 
Assertion (A): The energy of an electromagnetic wave is not equally distributed among the electric field and magnetic field.
Reason (R): The amplitude of electric field E0 and magnetic field B0 are related by the relation \(E_0 ={B_0\over c}\), where c is the velocity of light.

In the light of the above statements choose the correct answer from the options given below:
 
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. Both (A) and (R) are false.
Subtopic:  Properties of EM Waves |
 81%
From NCERT
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