FYYSIKA.EE

This paper describes the formation of a circumzenithal arc for the purpose of teaching light and
optics. A circumzenithal arc, an optic formation rarely witnessed by people, is formed in this study
using a water-filled cylindrical glass illuminated b…

This study is aimed at first introducing a well-known discrepant event; inseparable phone books and
second, turning it into an experiment for high school or middle school students. This discrepant
event could be used especially to indicate how fricti…

The addition of soap to vortexing water produces bubble structures around the vortices’ ‘throats’
that resemble galaxies of stars. Such soap-bubble models can be used to suggest the prediction that,
at the heart of spiral galaxies may lie super…

This paper describes the formation of a circumzenithal arc for the purpose of teaching light and
optics. A circumzenithal arc, an optic formation rarely witnessed by people, is formed in this study
using a water-filled cylindrical glass illuminated b…

This study is aimed at first introducing a well-known discrepant event; inseparable phone books and
second, turning it into an experiment for high school or middle school students. This discrepant
event could be used especially to indicate how fricti…

The addition of soap to vortexing water produces bubble structures around the vortices’ ‘throats’
that resemble galaxies of stars. Such soap-bubble models can be used to suggest the prediction that,
at the heart of spiral galaxies may lie super…

Measurements are presented of the impact time, peak force and centre of mass displacement of a
ping-pong ball impacting vertically on a hard, horizontal surface. The results are compared with a
recent measurement described in this journal.

In 1820 the Danish scientist Hans Christian Ørsted discovered the relationship between electricity
and magnetism by his famous wire-compass experiment. Ørsted was one of the foremost scientists of
the nineteenth century, and he was also one of the …

Newton’s law of universal gravitation underpins our understanding of the dynamics of the Solar
System and of a good portion of the observable universe. Generally, in the classroom or in
textbooks, the law is presented initially in a qualitative way…

Measuring voltage–current and voltage–power curves of a photovoltaic module is a nice experiment for
high school and undergraduate students. In labs where real sunlight is not available this experiment
requires a solar simulator. A prototype of a…

The present paper accounts for progress in physics teaching in the sense that a problem, which has
been closed to students for being too difficult, is gained for the high school curriculum. This
problem is the compound Atwood machine with three bodie…

In this study, a method to measure the Earth’s axial tilt is attempted by using a telescope. As a
principal instrument, telescopes in astronomy courses are mostly to verify the astronomical objects
in sky and not to make sense of astronomical event…

This frontline describes a simple way to demonstrate the concept of optical logic gates to
undergraduate and postgraduate students. This will give a new perspective to students into looking
at a very old experiment in physics.

Newton’s law of universal gravitation underpins our understanding of the dynamics of the Solar
System and of a good portion of the observable universe. Generally, in the classroom or in
textbooks, the law is presented initially in a qualitative way…

In this study, a method to measure the Earth’s axial tilt is attempted by using a telescope. As a
principal instrument, telescopes in astronomy courses are mostly to verify the astronomical objects
in sky and not to make sense of astronomical event…

The present paper accounts for progress in physics teaching in the sense that a problem, which has
been closed to students for being too difficult, is gained for the high school curriculum. This
problem is the compound Atwood machine with three bodie…

This frontline describes a simple way to demonstrate the concept of optical logic gates to
undergraduate and postgraduate students. This will give a new perspective to students into looking
at a very old experiment in physics.

In 1820 the Danish scientist Hans Christian Ørsted discovered the relationship between electricity
and magnetism by his famous wire-compass experiment. Ørsted was one of the foremost scientists of
the nineteenth century, and he was also one of the …

Measuring voltage–current and voltage–power curves of a photovoltaic module is a nice experiment for
high school and undergraduate students. In labs where real sunlight is not available this experiment
requires a solar simulator. A prototype of a…

Measurements are presented of the impact time, peak force and centre of mass displacement of a
ping-pong ball impacting vertically on a hard, horizontal surface. The results are compared with a
recent measurement described in this journal.

The terminal velocity for a bubble of gas is determined as a function of its volume and gas
temperature, and pressure as an effect of buoyancy. Only volume variation is considered and not
shape deformation. The limits of applicability of the expressi…

The terminal velocity for a bubble of gas is determined as a function of its volume and gas
temperature, and pressure as an effect of buoyancy. Only volume variation is considered and not
shape deformation. The limits of applicability of the expressi…

Although the zero-work forces do no work, they do have an impact on the work done on a system. The
role of the zero-work forces is explained and their importance is demonstrated in the context of a
paradox connected with the work-energy theorem. A ge…

Secure communication protocols are becoming increasingly important, e.g. for internet-based
communication. Quantum key distribution (QKD) allows two parties, commonly called Alice and Bob, to
generate a secret sequence of 0s and 1s called a key that …

It is common to introduce optical tweezers using either geometric optics for large particles or the
Rayleigh approximation for very small particles. These approaches are successful at conveying the
key ideas behind optical tweezers in their respectiv…

Planck’s law for black-body radiation marks the origin of quantum theory and is discussed in all
introductory (or advanced) courses on this subject. However, the question whether Planck really
implied quantisation is debated among historians of phy…

Secure communication protocols are becoming increasingly important, e.g. for internet-based
communication. Quantum key distribution (QKD) allows two parties, commonly called Alice and Bob, to
generate a secret sequence of 0s and 1s called a key that …

Although the zero-work forces do no work, they do have an impact on the work done on a system. The
role of the zero-work forces is explained and their importance is demonstrated in the context of a
paradox connected with the work-energy theorem. A ge…

Planck’s law for black-body radiation marks the origin of quantum theory and is discussed in all
introductory (or advanced) courses on this subject. However, the question whether Planck really
implied quantisation is debated among historians of phy…

It is common to introduce optical tweezers using either geometric optics for large particles or the
Rayleigh approximation for very small particles. These approaches are successful at conveying the
key ideas behind optical tweezers in their respectiv…

We point out three errors present in the circuit diagram in figure 1, as well as two typographical
errors. The corrections to these errors do not have any impact on the overall conclusions of the
paper.