Which among the following order of decreasing wavelengths of electromagnetic waves are correct?  I. Radio waves II. Infrared rays  III. Visible light  IV. X-rays Choose the answer from the following code: 

Which among the following order of decreasing wavelengths of electromagnetic waves are correct?  I. Radio waves II. Infrared rays  III. Visible light  IV. X-rays Choose the answer from the following code:  Correct Answer I, II, III, IV 

CONCEPT:

Electromagnetic spectrum:

• It is a collection of a range of different waves in sequential order from radio to gamma electromagnetic waves.
• Frequency (ν) = speed of light (c)/wavelength (λ)

Infrasonic waves: 

• The frequency range of these types of a wave is below 20Hz. Humans cannot detect it.
• Example: Sound produced by Earthquake, Volcanic eruption and ocean waves, etc.

Radio waves:

• The lowest frequency portion comes in radio waves generally, has wavelengths range between 1mm to 100km or frequencies between 300 GHz to 3 kHz.
• There are several subcategories in between these waves like AM and FM radio.

Visible Light: 

• A portion in the spectrum of electromagnetic waves that is visible to the human eye, ranging roughly between 400 nm to 700 nm.
• Red has the longest wavelength and lowest frequency in this visible spectrum.
• Violet has the smallest wavelength and highest frequency in the visible spectrum.

X-rays: 

• It is an electromagnetic wave with wavelength range 0. 1Å – 100Å.
• The wavelength of X-rays is small in comparison to the wavelength of the light. Hence they carry more energy.