9303753286127016 A particle of mass M at rest decays into two masses m1 and m2with non-zero velocities. What is the ratio λ1/λ2 of de Broglie wavelengths of particles?

A particle of mass M at rest decays into two masses m1 and m2with non-zero velocities. What is the ratio λ1/λ2 of de Broglie wavelengths of particles?

 We know that, according to de-Broglie’s hypothesis, the momentum of the particle is, p = hc/λ

Here,

  • h is Planck’s constant
  • c is the speed of light
  • λ is the de Broglie wavelength.

According to the law of conservation of momentum, the momentum of a system remains conserved.

Therefore, we can write, Mv=m1v1 + m2v2

Here,

  • v is the velocity of parent particle,
  • v1 is the velocity m1 and m1 is the velocity of m2 .

Since the parent particle is at rest, the initial velocity v is zero. Therefore, the above equation becomes,

0=m1v1 + m2v2 ⇒ m1v1 =−m2v2

Therefore, from the above equation, the momentum of the particle of mass m1 and the momentum of the particle of mass m2 is equal.

So, we can write, p1=p2

⇒ hc/λ1 = hc/λ2

Planck’s constant h and speed of light c is constant for both particles.

Therefore, the wavelength of these particles is the same.

Therefore, we can write, ∴ λ1= 1

Balkishan Agrawal

At the helm of GMS Learning is Principal Balkishan Agrawal, a dedicated and experienced educationist. Under his able guidance, our school has flourished academically and has achieved remarkable milestones in various fields. Principal Agrawal’s vision for the school is centered on providing a nurturing environment where every student can thrive, learn, and grow.

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