An object of mass 1 kg is moving with a velocity of 10 m/s. Its de Broglie wavelength is (h = 6.63×10⁻³⁴ Js)
A. 6.63 × 10⁻³⁵ m
B. 6.63 × 10⁻³³ m
C. 6.63 × 10⁻³⁶ m
D. 6.63 × 10⁻³⁴ m
Answer: Option A
Solution (By JKSSB Mock Tests)
λ = h/(mv) = 6.63×10⁻³⁴/(1×10) = 6.63×10⁻³⁵ m. Extremely small, not observable. For electron it's significant. de Broglie hypothesis: matter waves. This is modern physics.
Explanation:
Speed of sound: solids > liquids > gases. In steel ~5000 m/s, water ~1500 m/s, air ~340 m/s. Vacuum no propagation. Speed depends on density and elasticity.
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