Question
Download Solution PDFWhich has highest penetrating power?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCONCEPT:
- Radioactivity: The phenomenon of spontaneous emission of radiations by heavy elements is called radioactivity.
- The elements which show this phenomenon is called radioactive elements.
EXPLANATION:
- Nuclear Radiations: According to Rutherford's experiment when a sample of a radioactive substance is put in a lead box and allows the emission of radiation through a small hole only.
- When the radiation enters the external electric field, they split into three parts (α – rays, β – rays, and γ – gamma rays).
- The penetration power of β – rays is 100 times that of α – rays. They are absorbed by the aluminum foil of 5 mm thickness.
- The penetration power of γ – rays is 1000 times that of α – rays. They can penetrate a 30 cm thick iron block.
- The increasing order of penetrating powers is α – rays < β – rays < γ – gamma.
- Thus, Gamma rays have the highest penetrating power. Therefore option 2 is correct.
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