List-I
(Electromagnetic waves)List-II
(Wavelength range)(A) X-rays (I) 1mm to 700 nm (B) Radio waves (II) 0.1m to 1 mm (C) Infrared waves (III) 1nm to $10^{-3}$ nm (D) Microwaves (IV) > 0.1 m
Choose the correct answer from the options given below:
Matching Electromagnetic Waves with Wavelength Ranges
This question involves matching specific types of electromagnetic waves with their characteristic wavelength ranges. To correctly answer this, we need to understand the order and approximate wavelengths of different parts of the electromagnetic spectrum.
Understanding the Electromagnetic Spectrum
The electromagnetic spectrum organizes all electromagnetic radiation based on its wavelength or frequency. The main types, in order of increasing wavelength (decreasing frequency and energy), are Gamma rays, X-rays, Ultraviolet, Visible light, Infrared, Microwaves, and Radio waves.
Detailed Analysis of Matches
Let's break down each option and match it with the provided wavelength ranges:
- (A) X-rays: X-rays have very short wavelengths, typically in the range of 0.01 nanometers (nm) to 10 nm. Option (III) lists the range as 1 nm to $10^{-3}$ nm (which is 0.001 nm). This range falls within the typical classification for X-rays.
- (B) Radio waves: These are the electromagnetic waves with the longest wavelengths. They generally have wavelengths greater than 1 millimeter (mm). Option (IV) provides the range as greater than 0.1 meters (or 10 cm). This is consistent with the definition of radio waves, which encompass even longer wavelengths.
- (C) Infrared waves: Infrared radiation sits between visible light and microwaves. Its wavelength range is typically from about 700 nanometers (nm) to 1 millimeter (mm). Option (I) lists this range as 1 mm to 700 nm, which accurately represents infrared waves.
- (D) Microwaves: Microwaves have wavelengths that are shorter than radio waves but longer than infrared. Their wavelength range is commonly cited as being between 1 millimeter (mm) and 1 meter (m). Option (II) provides the range 0.1 m to 1 mm (or 10 cm to 1 mm). This range fits the classification of microwaves.
Correct Matching Summary
Based on the analysis of each electromagnetic wave type and its standard wavelength ranges, the correct pairings are:
| List-I (Electromagnetic Waves) | List-II (Wavelength Range) | Correct Match |
|---|---|---|
| (A) X-rays | (III) 1 nm to $10^{-3}$ nm | (A) - (III) |
| (B) Radio waves | (IV) > 0.1 m | (B) - (IV) |
| (C) Infrared waves | (I) 1 mm to 700 nm | (C) - (I) |
| (D) Microwaves | (II) 0.1 m to 1 mm | (D) - (II) |
Therefore, the combination (A) - (III), (B) - (IV), (C) - (I), (D) - (II) correctly matches the electromagnetic waves with their respective wavelength ranges.
Important Questions from Electromagnetic Spectrum
- An electromagnetic wave propagates through a linear, isotropic, and homogeneous material medium.
If this medium has a relative permittivity of $\varepsilon_r$ and a relative permeability of $\mu_r$, and the speed of light in vacuum is $c$, what is the ratio of the speed of the electromagnetic wave in the medium ($v$) to its speed in vacuum ($c$)? The correct order of electromagnetic spectrum with decreasing frequency is:
The value of the proportionality constant μo/(4π) is equal to _________ Tm/A.
Match List I with List II
List – I
List – II
US New Military Bands for Microwaves
Frequency range in GHz
A.
H band
I.
2.000 ‐ 3.000 GHz
B.
J band
II.
4.000 ‐ 6.000 GHz
C.
G band
III.
6.000 ‐ 8.000 GHz
D.
E band
IV.
10.000 ‐ 20.000 GHz
Choose the correct answer from the options given below:
The wave number of the limiting line of the series (visible) in hydrogen spectrum is:
