Angular Momentum Transfer in Waves: Exploring the Mechanisms Behind the Twist

In summary, electromagnetic waves have the ability to transmit both orbital and spin angular momentum. This has been demonstrated through experiments with circularly polarized light and waves on a string. The angular momentum in the wave can be transferred to a rotating disc, showcasing its ability to transmit angular momentum.
  • #1
Himal kharel
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why can't a wave transmit angular momentum?
 
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  • #2
They can and do. Electromagnetic waves can carry both orbital and spin angular momentum. If you shine a beam of circularly polarized light on a plate, the plate will twist slightly. This has been http://prola.aps.org/abstract/PR/v50/i2/p115_1" .

You could do a similar experiment with waves on a string. Connect a rope to one edge of a disc mounted so that it is free to rotate about its axis. Hold the other end and send circular waves down the rope and you will be able to get the disc spinning. The angular momentum in the wave is imparted to the disc.
 
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FAQ: Angular Momentum Transfer in Waves: Exploring the Mechanisms Behind the Twist

What is the difference between wave and angular momentum?

Wave momentum refers to the transfer of energy through a medium in the form of a disturbance or oscillation. Angular momentum, on the other hand, is a property of rotating objects and is defined as the product of an object's moment of inertia and its angular velocity.

How is wave momentum calculated?

Wave momentum is calculated by multiplying the wave's velocity by its wavelength. The resulting value is the momentum of the wave.

Can wave momentum be transferred?

Yes, wave momentum can be transferred from one medium to another. This transfer of momentum is what causes waves to refract, diffract, and reflect.

What is the relationship between wave momentum and frequency?

The relationship between wave momentum and frequency is inverse. As the frequency of a wave increases, the wavelength decreases, resulting in a higher wave momentum. Similarly, as the frequency decreases, the wavelength increases, resulting in a lower wave momentum.

How is angular momentum conserved?

Angular momentum is conserved in a closed system, meaning that the total angular momentum of the system remains constant. This means that if one part of the system gains angular momentum, another part must lose an equal amount of angular momentum to maintain the overall balance.

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