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The kinetic energy of an electron, α -particle and a proton are given as 4 K, 2 K and K respectively. The de- Broglie wavelength associated with electron ( λ e ), α -particle ( λ α ) and the proton ( λ p ) are as follows:

1. λ α = λ p > λ e
2. λ α < λ p < λ e
3. λ α = λ p < λ e
4. λ α > λ p > λ e

Correct answer: λ α < λ p < λ e

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