Ionisation energy of He+ is 19.6 × 10–18 J atom–1. The energy of the first stationary state (n = 1) of Li2+ is
4.41 × 10–16 J atom–1
–4.41 × 10–17 J atom–1
–2.2 × 10–15 J atom–1
8.82 × 10–17 J atom–1
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The de Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 metres per second is approximately (Planck's constant h = 6.63 × 10–34 Js)