Question 44 of 62intermediate💡 UnderstandShort Answer2 marks

Arrange the following type of radiations in increasing order of frequency: (a) radiation from microwave oven (b) amber light from traffic signal (c) radiation from FM radio (d) cosmic rays from outer space (e) X-rays.

Correct Answer

The increasing order of frequency is: (c) radiation from FM radio < (a) radiation from microwave oven < (b) amber light from traffic signal < (e) X-rays < (d) cosmic rays from outer space.

Exercise: EXERCISES | Q: 2.45 | (Page 41)
For More Understanding

Explanation

The electromagnetic spectrum arranges radiations based on their increasing frequency. The radio frequency region is around 10610^6 Hz, the microwave region is around 101010^{10} Hz, and visible light (like amber light) is around 101510^{15} Hz. X-rays have very short wavelengths (~0.1 nm), giving them a higher frequency than visible light. Cosmic rays have the highest frequency among these options.

Solution Steps

  1. Step 1: Identify the frequency regions from the electromagnetic spectrum. Radio frequency is around 10610^6 Hz, microwave is around 101010^{10} Hz, and visible light is around 101510^{15} Hz.

  2. Step 2: Note that X-rays have very short wavelengths (~0.1 nm), meaning their frequency is higher than visible light.

  3. Step 3: Arrange all the given radiations in increasing order of frequency: FM radio < microwave oven < amber light < X-rays < cosmic rays.

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