Calculate the de Broglie wavelength associated with the following : (i) electrons moving with a speed of `10^(5)ms^(-1)` (ii) protons moving with a sp

Monjur Alahi

Calculate the de Broglie wavelength associated with the following :
(i) electrons moving with a speed of `10^(5)ms^(-1)`
(ii) protons moving with a speed of `10^(5)ms^(-1)`
(iii) a proton of momentum `2.26 xx 10^(-23)` kg `ms^(-1)`
(iv) a thermal neutron of energy 0.025 eV.


0 like 0 dislike
1 views
Share with your friends

1 Answers

Salim Ahmed Kawsar

Call

Correct Answer - `0.7278 xx 10^(-8)m`
`3.97 xx 10^(-12) m`
`0.29 xx 10^(-10) m`
`1.807 Å`
`0.1690 Å`
`0.01276 Å`

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
The de Broglie wavelength of an electron moving in a circular orbit is `lambda` . The minimum radius of orbit is :

Correct Answer - B We know `2 pir=nlambda` For minimum radius `n=1` `2pir_("min")=lambda` `r_("min")=lambda/(2pi)`

2 Answers 1 views
Deduce the condition when the De-Broglie wavelength associated with an electron would be equal to that associated with a proton if a proton is `1836`

Correct Answer - `v_(e)=1836 v_(p)` Debroglie wavelength associated with particle of mass `(m)` moving with velocity `(v)` is `lambda=h/(mv) rArr lambda_(P)=h/(m_(P)v_(P))` and `lambda_(e)=h/(m_(e)v_(e))` given `lambda_(p)=lambda_(e) rArr (h)/(m_(p)v_(p))=h/(m_(e)v_(e)) rArr m_(p)v_(p)=m_(e)v_(e)` `v_(e)/v_(p)=m_(p)/m_(e)=1836 rArr...

2 Answers 1 views
The approximate wavelength associated with a gold-ball weighting 200 g and moving at a speed of 5m/h is of the order of :

Correct Answer - C `lambda=(h)/(mv)=(6.625xx10^(-34))/(0.2xx5)xx3600~~10^(-30) m`

2 Answers 1 views
Calculate de-Broglie wavelength of hydrogen molecules `(H_(2))` present in a container at `400 K`. Assume that molecules travel at rms speed. Boltzman

Correct Answer - `1.02Å`

2 Answers 3 views
The circumference of circular orbit of electron in a `He^(+)` ion is five times the de-Broglie wavelength associated with the electron. Find the radiu

Correct Answer - `6.613 Å`

2 Answers 3 views
Calculate the de-Broglie wavelength in nm associated with a ball of mass 66 g moving with a speed of `2.5 xx 10^(5) ms^(-1)`. Given `h=6.6xx 10^(-34)

Correct Answer - `4 xx 10^(-19) nm`

2 Answers 1 views
Calculate the de-Broglie wavelength associated with an `alpha`-particle accelerated through a potential difference of 200 V. Given `m_(P) = 1.67 xx 10

Correct Answer - `0.007138 Å`

2 Answers 1 views
Calculate the velocity of a neutron having de Broglie wavelength of 10 fermi. Mass of neutron, `m_(n) = 1.7 xx 10^(-27)kg`. Neglect the relative effec

Correct Answer - `3.88 xx 10^(7) ms^(-1)`

2 Answers 1 views
A star is moving away from an observer with a speed of `500 kms^(-1)` .Calculate the Doppler shift if the wavelength of light emitted by the star is 6

Correct Answer - Increase of `10Å`

2 Answers 1 views
(a) Calculate the energy released if `.^(238)U` emits an `alpha` particle. (b) Calculate the energy to be supplied to `.^(238)U` if two protons and tw

Correct Answer - [(a) 4.25 MeV; (b) 23 MeV]

2 Answers 1 views
X