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The inter-planar spacing between the (2 2 1) planes of a cubic lattice of length 450 pm is
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A metal is irradiated with light of wavelength 660 nm. Given that the work that the work function of the metal is
1.0 eV, the de Broglie wavelength of the ejected electron is close to
The ΔH for vaporization of a liquid is 20 kJ/mol. Assuming ideal behaviour, the change in internal energy for the
vaporization of 1 mol of the liquid at 60°C and 1 bar is close to –
(A) 13.2 kJ/mol (B) 17.2 kJ/mol (C) 19.5 kJ/mol (D) 20.0 kJ/mol