Question

what is matter wave ? what do you understand by in phase and out phase ? calculate the wavelength associated with a body of mass 1.5 Kg moving with velocity of 100 m/s

Answer 1

A matter wave is the inherent wave associated with all matter. They are also called De-Broglie Waves.

They are calculated by the expression

$\lambda=\frac{h}{mv}$

Where $\lambda$ is the wavelength.

$\lambda=\frac{6.67*10^{-34}}{1.5*100}=4.417*10^{-36}m$

In phase, in context of waves, refers to waves whose troughs and crests lie on on the other. They may have different amplitudes and still be in phase.
The resultant wave is of greater amplitude than either.

Out of phase means where one wave is upwards while the other is downwards,i.e. they do not peak together but at a gap equal to half their time period, thus weakening the resultant wave.

Answer 2

Explanation:

A matter wave is the inherent wave associated with all matter. They are also called De-Broglie Waves.

They are calculated by the expression

\lambda=\frac{h}{mv}λ=

mv

h

Where \lambdaλ is the wavelength.

\lambda=\frac{6.67*10^{-34}}{1.5*100}=4.417*10^{-36}mλ=

1.5∗100

6.67∗10

−34

=4.417∗10

−36

m

In phase, in context of waves, refers to waves whose troughs and crests lie on on the other. They may have different amplitudes and still be in phase.

The resultant wave is of greater amplitude than either.

Out of phase means where one wave is upwards while the other is downwards,i.e. they do not peak together but at a gap equal to half their time period, thus weakening the resultant wave.