Question

Assertion : Out of Infrared and radio waves, the radio waves show more diffraction effect.

Reason (R): Radio waves have greater frequency than infrared waves.

• A. If both Assertion and Reason (R) are true and Reason (R) is the correct explanation of Assertion .
• B. If both Assertion and Reason (R) are true but Reason (R) is not the correct explanation of Assertion .
• C. If Assertion is true but Reason (R) is false.
• D. If both Assertion and Reason (R) are false.

Hint:

Radio waves show more diffraction effects because of their longer wavelengths, not due to their frequency.

Answer 1

The Correct Option is C

To evaluate the Assertion and Reason given in the question, let us analyze each statement:

Assertion: Out of Infrared and radio waves, the radio waves show more diffraction effect.

Diffraction is more pronounced when the wavelength of the wave is comparable to or larger than the obstacle or aperture size it encounters. Radio waves have longer wavelengths compared to infrared waves, which allows them to diffract more easily around obstacles. Hence, the Assertion is true.

Reason (R): Radio waves have greater frequency than infrared waves.

The frequency and wavelength of a wave are inversely proportional, as described by the equation:

\(v = fλ\)

where v is the speed of the wave (constant for light waves in a vacuum), f is the frequency, and λ is the wavelength. Radio waves actually have a lower frequency compared to infrared waves. Thus, the Reason is false.

Therefore, the conclusion is that the Assertion is true but the Reason is false.