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17/08/2021 10:29 am
Topic starter
The de Broglie wavelength of a car of mass 1000 kg and velocity 36 km/hr is:
(a) 6.626 × 10–34 m
(b) 6.626 × 10–38 m
(c) 6.626 × 10–31 m
(d) 6.626 × 10–30 m
1 Answer
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17/08/2021 10:35 am
Correct answer: (b) 6.626 × 10–38 m
Explanation:
λ = \(\frac{h}{mv}\)
h = 6.6 x 10–34 J-s
m = 1000 kg
v = 36 km/hr
= \(\frac{36 \times 10^3}{60 \times 60}\)m/sec
= 10 m/sec
∴ λ = \(\frac{6.6 \times 10^{-34}}{10^3 \times 10}\) = 6.626 × 10–38 m