Question

Which of the following electromagnetic wave has the least frequency? (A) radiowave (B) infrared radiation (C) microwave (D) x rays

Short answer

The electromagnetic wave with the least frequency among the given options is (A) radiowave.

Step-by-step solution

Recall the order of electromagnetic waves in the spectrum

The order of the different types of electromagnetic waves, from lowest to highest frequency, is as follows: 1. Radio waves 2. Microwaves 3. Infrared radiation 4. Visible light 5. Ultraviolet radiation 6. X-rays 7. Gamma rays Keep in mind that as we move from left to right in this order, the frequency of the electromagnetic waves increases.

Compare the frequencies of the given options

Based on the order mentioned in Step 1, let's determine the position of each option in the electromagnetic spectrum: (A) Radiowave - Position 1 (lowest frequency) (B) Infrared radiation - Position 3 (C) Microwave - Position 2 (D) X rays - Position 6 (higher frequency)

Identify the electromagnetic wave with the least frequency

From the comparisons in Step 2, it is evident that radiowaves (A) have the lowest frequency among the given options. So, the correct answer is (A) radiowave.