Answer:
For cardboard = 29.4 g/cm²
For aluminium = 113.4 g/cm²
For lead = 193.8 g/cm²
Explanation:
Given:
Density of the cardboard, d₁ = 0.6 g/cm³
Density of the aluminium, d₂ = 2.7 g/cm³
Density of the lead, d₃ = 11.4 g/cm³
Length of the cardboard, L₁ = 49 cm
Length of the aluminium, L₂ = 42 cm
Length of the lead, L₃ = 17 cm
Now,
The absorber thickness is calculated as:
= Density × Length
therefore,
For cardboard = d₁ × L₁ = 0.6 × 49 = 29.4 g/cm²
For aluminium = d₂ × L₂ = 2.7 × 42 = 113.4 g/cm²
For lead = d₃ × L₃ = 11.4 × 17 = 193.8 g/cm²
