Question

a) Arrange increasing order of frequency of x-rays, IR, UV, Radio waves

b) Which radiation has the highest energy

Answer 1

Answer:

highest frequency has highest energy because E =hv

highest energy has lowest wavelength E =h× c\wavelength

(a) frequency order -X ray > UV > IR

(b) gamma rays(v rays) has highest energy

Answer 2

Answer:

a) Increasing order of frequency is: -  Radio waves < IR < UV < X-Rays

b) Radiation with highest energy is X-rays amongst the given radiations.

Explanation:

• Electromagnetic radiation: -The only electromagnetic waves that were known to us at the time of Maxwell's prediction were visible light waves. Ultraviolet and infrared radiation were barely known.  X-rays and gamma rays were  identified by the close of the nineteenth century.
• We now understand that there are various sorts of waves that make up electromagnetic waves. These waves are grouped into the electromagnetic spectrum according to their frequency or wavelength. The electromagnetic spectrum includes the following broad categories of waves:

        1. Radio waves

       2.Microwaves

       3. ultraviolet rays

      4. visible light

      5. ultraviolet radiation

      6. X-rays

      7. Gamma rays

      They are here arranged in the decreasing order of wavelengths of the waves, with Gamma rays having the lowest wavelength and radio waves the longest wavelength.

• There is no clearly defined boundary between the waves. They are categorised according to how they are created and/or discovered.

• A wave's energy is inversely proportional to its wavelength: the lower the frequency or longer the wavelength, the lower the energy. Gamma rays contain the maximum energy in the electromagnetic spectrum, while long radio waves have the lowest.
• Of the waves given in the question, X-rays have the highest frequency and so possess the highest energy.