59. Cargo inspectors often use electromagnetic radiation to form images of objects inside large steel shipping containers like those shown below. Which type of electromagnetic radiation is used in this way?
Answer: B
Gamma rays are used in cargo inspection to form images of objects inside shipping containers.
Gamma rays are a type of electromagnetic radiation that can penetrate dense materials such as steel, making them suitable for inspecting the contents of large shipping containers.
A) Radio waves
Radio waves have longer wavelengths and lower energy compared to gamma rays. They are not effective for penetrating solid objects like steel containers, thus making them unsuitable for cargo inspection purposes.
B) Gamma rays
Gamma rays possess high energy and short wavelengths, allowing them to penetrate through thick materials. This characteristic is essential for cargo inspectors to create detailed images of the contents within steel containers, which is why gamma rays are the correct choice.
C) Ultraviolet radiation
Ultraviolet radiation has higher energy than visible light but is still less penetrating than gamma rays. It is primarily used for applications involving surface inspection or sterilization rather than penetrating dense materials like those found in shipping containers.
D) Visible light
Visible light is not capable of penetrating steel containers effectively. Its wavelengths are too long to provide the necessary imaging capabilities required for cargo inspection, making it an inadequate choice for this application.
Conclusion
Gamma rays are definitively the correct answer as they can penetrate dense materials, providing the necessary imaging for cargo inspections. Other options, such as radio waves, ultraviolet radiation, and visible light, lack the penetration ability required to effectively inspect the contents of large steel shipping containers. Therefore, gamma rays are the optimal choice for this purpose.