Match List - I with List - II
| |
LIST - I (Type of EM Wave) |
|
LIST - II (Application) |
|---|---|---|---|
| (A) | Microwaves | (I) | Cellular phones |
| (B) | Radio waves | (II) | Greenhouse effect |
| (C) | Infrared waves | (III) | Eye surgery |
| (D) | Ultraviolet rays | (IV) | Ovens |
Choose the correct answer from the options given below;
Correct Answer :
(A)-(IV), (B)-(1), (C)-(II), (D)-(III)
Solution :
The correct option is (A)-(IV), (B)-(I), (C)-(II), (D)-(III).
Let us understand the connection between each type of electromagnetic (EM) wave in List - I and its corresponding application in List - II:
(A) Microwaves matches with (IV) Ovens:
Microwaves have wavelengths in the range of millimeters to centimeters. They are widely used in household microwave ovens. The frequency of microwaves in these ovens is selected to match the resonant frequency of water molecules, causing them to vibrate rapidly and heat up food efficiently through dielectric heating.
(B) Radio waves matches with (I) Cellular phones:
Radio waves have the longest wavelengths and lowest frequencies in the electromagnetic spectrum. They are highly effective for long-distance communication because they can propagate easily through the atmosphere. Thus, they are used to transmit voice and data in cellular phone networks.
(C) Infrared waves matches with (II) Greenhouse effect:
Infrared waves are also known as heat waves because they are readily absorbed and emitted by molecules, causing thermal motion. Earth's surface absorbs solar radiation and re-radiates it as infrared radiation. Greenhouse gases (like carbon dioxide and water vapor) in the atmosphere trap these infrared waves, preventing them from escaping into space, which heats up the planet. This phenomenon is known as the greenhouse effect.
(D) Ultraviolet rays matches with (III) Eye surgery:
Ultraviolet (UV) rays possess high energy because of their short wavelengths. Excimer lasers, which emit ultraviolet radiation (typically at 193 nm), are used in precise eye surgeries such as LASIK. This high energy allows the laser to ablate or reshape the corneal tissue with extreme precision without damaging the surrounding areas.
Combining all the individual matches, we get:
(A) matches with (IV)
(B) matches with (I)
(C) matches with (II)
(D) matches with (III)
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