Simple Strobe | Punjabi
Channel: Arvind Gupta
Date: 2016-02-20

Used batteries are a big environmental menace but today we will discarded batteries we can make a very simple strobe. And coincidentally you will see the logo of nuclear radiation warning.
We just need used batteries and colored tape for this. Take a thin AA or AAA sized used battery. Hold it vertical and spin it. The battery falls down. It spins and rotates. It spins around the axis along its length. After falling it also rotates lengthwise in a circle. In this circle we will see our strobe.
Now attach a small piece colored tape at one end of the battery. Spin this battery with the colored tape part up.  And we can see amazing stroboscopic effect. Notice the nuclear radiation hazard sign. If you observe carefully you can see another effect. The sign spins slowly in one direction then it stops and after that in reverses direction. This effect is called the wagon wheel effect.
We can try the same activity with a piece of PVC pipe. We can see the same effect. However if we spin the pipe with pipe by putting our finger on the end without the tape we cannot see the strobe.
Spin the battery in different configurations, position and observe the strobe.
Question:
When we spin the battery with the tape at bottom we don’t see the strobe. Also when we cover one end of the battery completely with tape the effect vanishes.  Why?
Send us your answers at support@arvindguptatoys.com 

This work is supported by IUCAA (www.iucaa.in) and TATA Trust (www.tata.com/aboutus/sub_index/Tata-trusts)

Credits:,Ashok Rupner, Shivaji Mane, Jyoti Hiremath, Arvind Gupta, Vidula Mhaiskar TATA Trust: Education is one of the key focus areas for Tata Trusts, aiming towards enabling access of quality education to the underprivileged population in India. To facilitate quality in teaching and learning of Science education through workshops, capacity building and resource creation, Tata Trusts have been supporting Muktangan Vigyan Shodhika (MVS), IUCAA's Children’s Science Centre, since inception. To know more about other initiatives of Tata Trusts, please visit www.tatatrusts.org