Question

Choose the correct sequence of the radiation sources in increasing order of the wavelength of electromagnetic waves produced by them.

• A. X-ray tube, Magnetron valve, Radioactive source, Sodium lamp
• B. Radioactive source, X-ray tube, Sodium lamp, Magnetron valve
• C. X-ray tube, Magnetron valve, Sodium lamp, Radioactive source
• D. Magnetron valve, Sodium lamp, X-ray tube, Radioactive source

Answer 1

Answer: (B)

Radioactive source $\left(\sim 10^{-12} m \right) \rightarrow X$ -ray tube $\left(\sim 10^{-10} m \right)$
$\rightarrow$ Sodium lamp$\left(\sim 10^{-9} m \right) \rightarrow$ Magnetron valve $\left(\sim 10^{-3} m \right)$