Optics Question 69
Assertion : Only microwaves are used in radar. Reason : Because microwaves have very long wavelength.
Options:
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 are both false.
E) If assertion is false but reason is true.
Show Answer
Answer:
Correct Answer: A
Solution:
In a radar, a beam signal is needed in a particular direction which is possible if the wavelength of the wave is very small.
Since the wavelength of microwaves is a few millimeters, hence they are used in radar.
BETA
