358959
Assertion : The electromagnetic waves of shorter wavelength can travel longer distance on earth' surface than those of longer wavelengths. Reason : Shorter the wavelength, shorter is the velocity of electromagnetic waves propagation.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Short \(\lambda\) waves have low attenuation as they have high frequency and so high energy. So they travel long distances. Reason is false as all electromagnetic waves haves same \(v=c\). So correct option is (3).
PHXI15:WAVES
358960
Statement A : The velocity of electromagnetic waves depends on electric and magnetic properties of the medium. Statement B : Velocity of electromagnetic waves in free space is constant.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Option (3) is correct
PHXI15:WAVES
358961
The property which is not of an electromagnetic wave travelling in free space is that:
1 They are transverse in nature
2 The energy density in electric field is equal to energy density in magnetic field
3 They travel with a speed equal to \({\dfrac{1}{\sqrt{\mu_{0} \varepsilon_{0}}}}\)
4 They originate from charges moving with uniform speed
Explanation:
The EM waves are originated from accelerating charge. The charge moving with uniform velocity produces steady state magnetic field. Correct option is (4).
NEET - 2024
PHXI15:WAVES
358962
A plane electromagnetic wave of frequency \(25 \mathrm{MHz}\) travel in free space along the \(x\) direction. At a particular point in space and time, the electric vector is \(\vec{E}=6.3 \mathrm{~V} / \mathrm{m} \hat{j}\). What is the \(\vec{B}\) at this point?
1 \(2 \times {10^{ - 8}}\hat k\)
2 \(2.1 \times {10^{ - 8}}\hat k\,T\)
3 \(2.1 \times {10^{ - 8}}\hat J\,T\)
4 \(2 \times {10^{ - 8}}\hat J\,T\)
Explanation:
As we know \(B = \frac{E}{C} = \frac{{6.3}}{{3 \times {{10}^8}}} = 2.1 \times {10^{ - 8}}\;T\) As \(\vec{E}\) is along \(y\)-direction and wave is travelling along \(x\)-direction, therefore \(\vec{B}\) is along \(z\) direction because in propagation of \(e m\) wave \(E\,\,\& \,\,B\) fields are \(\perp\) to each other. \(\vec B = 2.1 \times {10^{ - 8}}\hat k\,T\)
NEET Test Series from KOTA - 10 Papers In MS WORD
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PHXI15:WAVES
358959
Assertion : The electromagnetic waves of shorter wavelength can travel longer distance on earth' surface than those of longer wavelengths. Reason : Shorter the wavelength, shorter is the velocity of electromagnetic waves propagation.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Short \(\lambda\) waves have low attenuation as they have high frequency and so high energy. So they travel long distances. Reason is false as all electromagnetic waves haves same \(v=c\). So correct option is (3).
PHXI15:WAVES
358960
Statement A : The velocity of electromagnetic waves depends on electric and magnetic properties of the medium. Statement B : Velocity of electromagnetic waves in free space is constant.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Option (3) is correct
PHXI15:WAVES
358961
The property which is not of an electromagnetic wave travelling in free space is that:
1 They are transverse in nature
2 The energy density in electric field is equal to energy density in magnetic field
3 They travel with a speed equal to \({\dfrac{1}{\sqrt{\mu_{0} \varepsilon_{0}}}}\)
4 They originate from charges moving with uniform speed
Explanation:
The EM waves are originated from accelerating charge. The charge moving with uniform velocity produces steady state magnetic field. Correct option is (4).
NEET - 2024
PHXI15:WAVES
358962
A plane electromagnetic wave of frequency \(25 \mathrm{MHz}\) travel in free space along the \(x\) direction. At a particular point in space and time, the electric vector is \(\vec{E}=6.3 \mathrm{~V} / \mathrm{m} \hat{j}\). What is the \(\vec{B}\) at this point?
1 \(2 \times {10^{ - 8}}\hat k\)
2 \(2.1 \times {10^{ - 8}}\hat k\,T\)
3 \(2.1 \times {10^{ - 8}}\hat J\,T\)
4 \(2 \times {10^{ - 8}}\hat J\,T\)
Explanation:
As we know \(B = \frac{E}{C} = \frac{{6.3}}{{3 \times {{10}^8}}} = 2.1 \times {10^{ - 8}}\;T\) As \(\vec{E}\) is along \(y\)-direction and wave is travelling along \(x\)-direction, therefore \(\vec{B}\) is along \(z\) direction because in propagation of \(e m\) wave \(E\,\,\& \,\,B\) fields are \(\perp\) to each other. \(\vec B = 2.1 \times {10^{ - 8}}\hat k\,T\)
358959
Assertion : The electromagnetic waves of shorter wavelength can travel longer distance on earth' surface than those of longer wavelengths. Reason : Shorter the wavelength, shorter is the velocity of electromagnetic waves propagation.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Short \(\lambda\) waves have low attenuation as they have high frequency and so high energy. So they travel long distances. Reason is false as all electromagnetic waves haves same \(v=c\). So correct option is (3).
PHXI15:WAVES
358960
Statement A : The velocity of electromagnetic waves depends on electric and magnetic properties of the medium. Statement B : Velocity of electromagnetic waves in free space is constant.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Option (3) is correct
PHXI15:WAVES
358961
The property which is not of an electromagnetic wave travelling in free space is that:
1 They are transverse in nature
2 The energy density in electric field is equal to energy density in magnetic field
3 They travel with a speed equal to \({\dfrac{1}{\sqrt{\mu_{0} \varepsilon_{0}}}}\)
4 They originate from charges moving with uniform speed
Explanation:
The EM waves are originated from accelerating charge. The charge moving with uniform velocity produces steady state magnetic field. Correct option is (4).
NEET - 2024
PHXI15:WAVES
358962
A plane electromagnetic wave of frequency \(25 \mathrm{MHz}\) travel in free space along the \(x\) direction. At a particular point in space and time, the electric vector is \(\vec{E}=6.3 \mathrm{~V} / \mathrm{m} \hat{j}\). What is the \(\vec{B}\) at this point?
1 \(2 \times {10^{ - 8}}\hat k\)
2 \(2.1 \times {10^{ - 8}}\hat k\,T\)
3 \(2.1 \times {10^{ - 8}}\hat J\,T\)
4 \(2 \times {10^{ - 8}}\hat J\,T\)
Explanation:
As we know \(B = \frac{E}{C} = \frac{{6.3}}{{3 \times {{10}^8}}} = 2.1 \times {10^{ - 8}}\;T\) As \(\vec{E}\) is along \(y\)-direction and wave is travelling along \(x\)-direction, therefore \(\vec{B}\) is along \(z\) direction because in propagation of \(e m\) wave \(E\,\,\& \,\,B\) fields are \(\perp\) to each other. \(\vec B = 2.1 \times {10^{ - 8}}\hat k\,T\)
358959
Assertion : The electromagnetic waves of shorter wavelength can travel longer distance on earth' surface than those of longer wavelengths. Reason : Shorter the wavelength, shorter is the velocity of electromagnetic waves propagation.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Short \(\lambda\) waves have low attenuation as they have high frequency and so high energy. So they travel long distances. Reason is false as all electromagnetic waves haves same \(v=c\). So correct option is (3).
PHXI15:WAVES
358960
Statement A : The velocity of electromagnetic waves depends on electric and magnetic properties of the medium. Statement B : Velocity of electromagnetic waves in free space is constant.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Option (3) is correct
PHXI15:WAVES
358961
The property which is not of an electromagnetic wave travelling in free space is that:
1 They are transverse in nature
2 The energy density in electric field is equal to energy density in magnetic field
3 They travel with a speed equal to \({\dfrac{1}{\sqrt{\mu_{0} \varepsilon_{0}}}}\)
4 They originate from charges moving with uniform speed
Explanation:
The EM waves are originated from accelerating charge. The charge moving with uniform velocity produces steady state magnetic field. Correct option is (4).
NEET - 2024
PHXI15:WAVES
358962
A plane electromagnetic wave of frequency \(25 \mathrm{MHz}\) travel in free space along the \(x\) direction. At a particular point in space and time, the electric vector is \(\vec{E}=6.3 \mathrm{~V} / \mathrm{m} \hat{j}\). What is the \(\vec{B}\) at this point?
1 \(2 \times {10^{ - 8}}\hat k\)
2 \(2.1 \times {10^{ - 8}}\hat k\,T\)
3 \(2.1 \times {10^{ - 8}}\hat J\,T\)
4 \(2 \times {10^{ - 8}}\hat J\,T\)
Explanation:
As we know \(B = \frac{E}{C} = \frac{{6.3}}{{3 \times {{10}^8}}} = 2.1 \times {10^{ - 8}}\;T\) As \(\vec{E}\) is along \(y\)-direction and wave is travelling along \(x\)-direction, therefore \(\vec{B}\) is along \(z\) direction because in propagation of \(e m\) wave \(E\,\,\& \,\,B\) fields are \(\perp\) to each other. \(\vec B = 2.1 \times {10^{ - 8}}\hat k\,T\)
