Question

The figure represents the observed intensity of x–rays emitted by two different tubes A and B as a function of wavelength l. For the tube A, the potential difference between the filament and target is V_A and atomic number of target is Z_A. For the tube B, corresponding potential difference is V_B and the atomic number is Z_B . The solid curve is for tube A and dotted curve for tube B, then –

• A. Z_A> Z_B, V_A> V_B
• B. Z_A = Z_B, V_A = V_B
• C. Z_A< Z_B, V_A> V_B
• D. Z_A< Z_B, V_A< V_B

Answer 1

Answer: (C)

Z_A< Z_B, V_A> V_B

Answer 2

K_a wavelength is smaller for target having larger Z. Cut-off wavelength is smaller for greater V.