An electron is moving with a kinetic energy of 4.55 × 1 0 - 25 J. The de Broglie wavelength for it is (Given: h = 6.626 × 10 − 34 , m e = 9.1 × 10 − 31 kg )

Question

An electron is moving with a kinetic energy of 4.55 × 1 0 - 25 J. The de Broglie wavelength for it is (Given: h = 6.626 × 10 − 34 , m e = 9.1 × 10 − 31 kg ), 7.2 × 1 0 - 7 m, 72 × 1 0 - 7 m, 0.72 × 1 0 - 7 m, 4.2 × 1 0 - 7 m

MARKS App · Accepted Answer

K .E . = 1 2 mv 2 V = 2 K E m = 2 × 4.55 × 1 0 - 25 9.1 × 1 0 - 31 k g = 10 3 mS − 1 λ = h m v = 6.626 × 1 0 - 34 9.1 × 1 0 - 31 × 1 0 3 = 7.2 × 10 − 7 m

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