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Identify the correct statement (s)...

Identify the correct statement (s)

A

Wavelength associated with a `1 kg` ball moving with the velocity `100 m//s` can't be calculated.

B

Wave nature of the running train is difficult to observe because wavelength is extermely small.

C

Wavelength associated with the electron can be calculated using the formulae `E=(hc)/(lambda)`

D

If an electron is accelerated through `20 V` potential difference if it has already `5eV` kinetic energy then wavelgnth of the electron is approximately `sqrt(6) Å`.

Text Solution

Verified by Experts

The correct Answer is:
B, D
(A) `lambda` can be calculated as : `lambda=h/(mv)=(6.626xx10^(-34))/(1xx100)=6.626xx10^(-36) m`. (very small).
(B) de-Broglie wavelength associated with macroscopic particles is extremely small and so, difficult to observe.
(C) de-Broglie wavelength associated with electron can calculated by using `lambda=h/(mv)`.
(D) `KE_(f)=5+20=25 eV :. lambda=sqrt(150/(KE_(f)))=sqrt(150/25)=sqrt(6) Å`
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