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A : All electromagnetic waves travel thr...

A : All electromagnetic waves travel through vacuum with same speed but they have different wavelength or frequency.
R : The wavelength of the electromagnetic waves is often correlated with and characteristic size of the system that produces and radiates them.

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)

C

If assertion is true statement but Reason is false, then mark (3)

D

If both Assertion and Reason are false statements, then mark (4)

Text Solution

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The correct Answer is:
A
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AAKASH INSTITUTE ENGLISH-ELECTROMAGNETIC WAVES-ASSIGNMENT SECTION - D Assertion-Reason Type Questions
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  2. A : All electromagnetic waves travel through vacuum with same speed bu...

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  3. A : High frequency electromagnetic waves are detected by some means ba...

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  4. A : infrared waves are often called heat waves. R : Infrared waves v...

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  5. A : The centre of sensitivity of our eyes coincides with the centre of...

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  6. A : Long distance radio broadcasts use short-wave bands. R : Ionosp...

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  7. A : It is necessary to use satellites for long distance TV transmissi...

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  8. A : Optical and radio telescopes are built on the ground but X-ray ...

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  9. A : If the earth did not have an atmosphere, its average surface temp...

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  10. A : It has been predicted that a global nuclear war on the earth would...

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  11. A : In an EM wave the magnitude of the electric field vector is more ...

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  12. A : The displacement current goes through the gap between the plates...

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  13. As the frequency of an ac circuit increases, the current first increas...

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  14. A : When cooking in microwave ovens, metal containers are used. R :...

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  15. A : Food is cooked faster by microwaves than by conventional gas burne...

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  16. A : Microwaves are commonly used in radar to locate flying objects. ...

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  17. A : Environmental damage has depleted the ozone layer in the atmosphe...

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  18. A: The electrical. Conductivity of the Earth's atmosphere does not cha...

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  19. A : Static crashes are heard on a radio when a lightening flash occurs...

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  20. A : TV signals are affected if a low flying aircraft passes by or a p...

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