Question

Identify the reason why an observer cannot detect the wave nature of a fast moving truck .

• A. The momentum of the truck is too large
• B. The velocity of the wave is too large
• C. There are no waves to be detected
• D. The frequency is too low
• E. The wavelengths are too small

Answer 1

Answer: (D)

The frequency is too low

The de-Broglie's wavelength associated with a moving matter is given by ,

$\lambda =h/p$ ,

where $h=$ planck's constant ,

$p=$ momentum of matter ,

now , a moving truck has a very small momentum therefore the wavelength associated with it is very large or frequency is very much low , so an observer cannot observe it .