A particle of mass 'm' is projected from ground with velocity u making angle `theta` with the vertical. The de-Broglie wave length of the particle at the highest point is:

A particle of mass m is projected form ground with velocity u making angle theta with the vertical. The de Broglie wavelength of the particle at the highest point is

A particle of mass m is projected form ground with velocity u making angle theta with the vertical. The de Broglie wavelength of the particle at the highest point is

A particle is projected from the ground with velocity u making an angle theta with the horizontal. At half of its maximum heights,

A particle of mass m is projected with a velocity mu at an angle of theta with horizontal.The angular momentum of the particle about the highest point of its trajectory is equal to :