Explanation:
To understand why the correct answer is option 'C' (microwaves), let's start by discussing what a wavelength is.

Definition of Wavelength:
Wavelength is the distance between two corresponding points on a wave. It is usually measured in meters, but can also be expressed in other units such as centimeters or nanometers.

Understanding the Spectrum:
The spectrum refers to the range of electromagnetic waves arranged in order of increasing wavelength or decreasing frequency. It includes various types of waves such as radio waves, microwaves, infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays.

Relationship between Wavelength and Spectrum:
Different types of waves in the electromagnetic spectrum have different wavelength ranges. Generally, longer wavelengths are associated with lower frequencies, while shorter wavelengths are associated with higher frequencies.

Identifying the Correct Option:
In the given question, we are told that the wavelength is 10 cm. Now, let's analyze the options to determine which one corresponds to a wavelength of this magnitude.

a) Infrared Rays:
Infrared rays have wavelengths ranging from about 700 nm (nanometers) to 1 mm. The given wavelength of 10 cm (or 100 mm) falls within this range. However, since the question asks for the corresponding spectrum, we need to find a more accurate option.

b) Ultraviolet Rays:
Ultraviolet rays have wavelengths ranging from about 10 nm to 400 nm. The given wavelength of 10 cm is much greater than the upper limit of this range. Therefore, ultraviolet rays can be ruled out.

c) Microwaves:
Microwaves have wavelengths ranging from about 1 mm to 1 meter. The given wavelength of 10 cm falls within this range. Therefore, option 'C' (microwaves) is a possible answer.

d) Gamma Rays:
Gamma rays have very short wavelengths, typically less than 10 picometers (pm). The given wavelength of 10 cm is much greater than the upper limit of this range. Therefore, gamma rays can be ruled out.

Conclusion:
Based on the analysis, we can conclude that a wavelength of 10 cm corresponds to the spectrum of microwaves.