Question 63: EM waves

Question

Given below are two statements: one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$
Assertion A : EM waves used for optical communication have longer wavelengths than that of microwave, employed in Radar technology.
Reason R : Infrared EM waves are more energetic than microwaves, (used in Radar)
In the light of given statements, choose the correct answer from the options given below.

Accepted Answer

Optical communication is performed in the frequency range of $1 \mathrm{THz}$ to $1000 \mathrm{THz}$.
(Microwave to UV)
So, EM waves used for optical communication have shorter wavelength than that of microwaves used in RADAR.
Also, $U_{	ext {INFRARED }}>U_{	ext {MICROWAVE }}$
$	herefore$ Infrared EM waves are more energetic than microwave

Answer

Both $$\mathrm{A}$$ and $$\mathrm{R}$$ are true but $$\mathrm{R}$$ is NOT the correct explanation of $$\mathrm{A}$$

Answer

$$\mathrm{A}$$ is true but $$\mathrm{R}$$ is false

Answer

Both $$\mathrm{A}$$ and $$\mathrm{R}$$ are true and $$\mathrm{r}$$ is the correct explanation of $$\mathrm{A}$$

Answer

$$\mathrm{A}$$ is false but $$\mathrm{R}$$ is true

EM waves

Choose the correct answer: