# Physics Question + Ans

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Physics pre-assessment research task 1. Describe de Broglie’s proposal that any kind of particle has both wave and particle properties
De Broglie suggested that if light can behave as both a wave and as a photon, particles could also have dual character. He proposed that all particles had wave properties as well as particle properties. He proposed that the wavelength is inversely proportional to the momentum of the particle, now known as the de Broglie wavelength of a particle and given by, λ=hmv. λ= Wavelength of light (m) h= Planck’s constant 6.626 x 10^-34 (J) m= Mass of the particle (kg)
V= Speed of the particle (light) mv= Momentum of particle (kg m/s)

2. Define wave diffraction and interference
Diffraction-is the bending of waves as they pass around the corner of a barrier or as they move through obstacles such as a slit.

Wave interference is the phenomenon that occurs when two waves meet while traveling along the same medium. The interference of waves causes the medium to take on a shape that results from the net effect of the two individual waves upon the particles of the medium.

Destructive interference is a type of interference that occurs at any location along the medium where the two interfering waves have a displacement in the opposite direction. For instance, when a sine pulse with a maximum displacement of +1 unit meets a sine pulse with a maximum displacement of -1 unit, destructive interference occurs. This is depicted in the diagram below.

Constructive interference is a type of interference that occurs at any location along the medium where the two interfering waves have a displacement in the same direction. In this case, both waves have an upward displacement; consequently, the medium has an upward displacement that is greater than the displacement of the two interfering pulses.

3. Dad 4. Describe the work of...

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