Radiations of intensity 0.5 W/m²
are striking a metal plate.
The pressure on the plate is
(a) 0.166 × 10⁻⁸ N/m² (b) 0.332 × 10⁻⁸ N/m²
(c) 0.111 × 10⁻⁸ N/m² (d) 0.083 × 10⁻⁸ N/m²
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Hard X-rays for the study of fractures in bones should have
a minimum wavelength of 10⁻¹¹ m. The accelerating voltage
for electrons in X-ray machine should be
(a) < 124 kV
(b) > 124 kV
(c) between 60 kV and 70 kV
(d) = 100 kV
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