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Emission and Absorption Spectra

Assertion: Sa...

Question

Assertion: Satellite communication is possible with high frequency only.
Reason: Very high frequencies are reflected by the earths ionosphere.

A

Assertion and reason are true and reason is the correct explanation of assertion

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B

Assertion and reason are true but reason is not correct explanation of assertion

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C

Assertion is true but reason is false

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D

Assertion is false but Reason is true.

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Solution

The correct option is B Assertion is true but reason is false
Assertion is True. The correct reason for this is that Low frequency signal are reflected by the atmosphere but high frequency signals are not, and they go out of the atmosphere, which need to be received by the satellite which sends them back to earth.

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Similar questions

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:
Assertion: Short wave bands are used for transmission of radio waves to a large distance.
Reason : Short waves are reflected by ionosphere
(a)If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b)If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c)If assertion is true but reason is false.
(d)If the assertion and reason both are false.
(e)If assertion is false but reason is true.

Q. (i)
Assertion: A circle is not a rectilinear figure.
Reason: A figure formed by straight lines only is called a rectilinear figure.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.
(ii)
Assertion: All right angles are equal to one another.
Reason: A unique line passes through a single point.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

Q. Assertion : Photosensitivity of a metal is high if its work function is small.

Reason : Work function $h f_{0}$ where $f_{0}$ is the threshold frequency.

Q. Assertion : Amount of cyanocobalamine required daily is 3 mcg
Reason : Its deficiency causes pernicious anaemia

Q. Assertion: C₄ – photosynthetic pathway is more efficient than C₃ pathway Reason: Photorespiration is suppressed in C₄ plants

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