Question

________ gives a better image of the human skeleton.
A. Camera
B. X-ray
C. Infrared rays
D. None of these

Answer 1

Hint: The human skeleton system is made up of bones and these are dense structures made of calcium. Calcium has a high atomic number which can absorb high energy penetrating electromagnetic radiations. These radiations range from \[3\times {{10}^{16}}Hz\] to \[3\times {{10}^{19}}Hz\].

Complete answer:
The human skeleton system is made up of several bones connected to each other which support the muscles and organs of the body. Projectional radiography is done to visualize the human skeleton system using highly energetic penetrating X-rays. The bones are made of dense material and the main component is calcium. Calcium has a high atomic number which allows it to efficiently absorb X-rays. The two-dimensional images are produced due to the penetrating effect of X-rays.
The more the X-rays absorbed the darker the region will appear on the X-ray sheet as less amount of X-rays reaches the detector. Tissue differences are hard to detect as they have low absorbing efficiency. The pathology of the skeleton system can be easily detected using X-rays. Some of the diseases in soft tissues can also be detected. Injuries to bones can be clearly visualized through X-rays.
Pneumonia, pulmonary edema, or lung cancer can be detected in the chest using chest X-rays. Kidney stones and gallstones can also be visualized through projectional radiography. Camera and infrared rays cannot penetrate the bones and thus cannot be used to get the image of the human skeleton.

Hence, option B) is the right answer.

Note: Long time exposure to X-rays can lead to damage to cells of the body. There is a higher risk of getting cancer from X-rays due to long exposures. This is because X-rays can cause mutations which leads to modification of the nitrogenous bases in DNA. Thus, they should not be used regularly.