Which of the following physical quantities has no units?

[A] Reynold Number

[B] Rydberg constant
[C] Wave number
[D] Hubble constant

1 thought on “Which of the following physical quantities has no units?”

  1.  A [ Reynold Number ]
    Notes:
    Reynold Number has no units. The Reynolds number is the ratio of inertial forces to viscous forces. It is used for predicting if a flow condition will be laminar or turbulent. 

    • Unit of Rydberg constant: m-1
    • Unit of Wave number = m-1
    • Unit of Hubble constant = sec-1

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