Which of the following expressions represents the de-Broglie relationship?

What is the mass of a particle with a wavelength of $3.313 \mathring{A}$ moving with a speed of $2.0 \times 10^8 \ m \ s^{-1}$?

The atomic masses of helium and neon are $4.0$ and $20.0 \ amu$ respectively. The value of the de Broglie wavelength of helium gas at $-73^{\circ} C$ is $M$ times the de Broglie wavelength of neon at $727^{\circ} C$. The value of $M$ is

If the kinetic energy of a particle is reduced to half,the de-Broglie wavelength becomes

Which of the following has the largest de Broglie wavelength (all have equal velocity)?

Number of waves formed by a Bohr electron in one complete revolution in its third orbit is