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Resonance fluorescence is demonstrated by illuminating a
sodium vapour with white visible light. The emitted light is
spectrally analyzed and shows the emission spectrum of sodium.
Therefore the same atomic levels are involved in both
absorption and emission.
If a circular disc separated into various differently coloured sectors is rotated by a motor so fast that the eye can no longer distinguish the colours, a mixed colour is then perceived. By varying the composition and size of the sectors, it is possible to give the impression of any ...
The students should measure length, diameter, and hole depth of
various objects with a measuring tape and/or vernier caliper as
possible. In doing this they should choose and use the more
suitable measuring device. The results should be entered in the
table as a numerical value ...
The student should count the oscillations of a pendulum while
timing them with the aid of a stopwatch. To determine the
dependence of the oscillation period on the length of the
pendulum is shortened by 50% in the second part of the
The oscillation period of ...
1. The students should determine the mass of solid bodies with
the aid of a balance.
2. The measurement of the mass of liquids can only be performed
using a container. The students should determine the mass from the
difference of two measurements.
How does ...
The students should determine the volume of 3 solid bodies. In
doing this they should know that the cubic meter (m3) is
the unit of volume and also that the term liter (l) is very
In the previous experiments on determination of mass and volume
(ME 1.3 and ME 1.4), the students have learned that both metal
columns have the same volume but different masses. They know that
the two objects consist of iron and aluminium. Obviously, the
two materials ...
In the determination of the density of solids in Experiment ME
1.5, the density was determined as the quotient of mass and volume
from a weighing to determine the mass and measurement of volume by
different methods. As a prerequisite for this experiment, it was
assumed that the ...
The students should become acquainted with the dependence of the
reading of spring balances on their orientation and with their
With the spring balance adjusted for use in the normal vertical
position, the weight F in N of different objects should ...
1. The students should learn with the help of the spring balance
that a force on a body can only be exerted when a counterforce acts
on it simultaneously.
2. Using two spring balances, the students should experimentally
determine that the forces on both spring balances are ...
The students are to determine the weight which a mass
experiences in the earth's gravitational field with a spring
balance. They should know that force is measured in N = kg
m∕s2 and recognize that weight is proportional to
mass. The proportionality factor is ...
The students should verify the declaration of Hooke's Law, i.e.
the proportionality of force and extension within the elasticity
range of an elastic body, with measurements on 2 helical springs
having different spring constants. These springs will be weighed
down with mass ...
The students should add a scale to an uncalibrated spring
balance by loading it with mass pieces.
In doing so they should know that a mass of 100 g
represents a weight (force) of 1 N in the gravitation field of
How does a spring balance get its ...
On the one hand, the students should investigate the effect of
two forces acting in the same direction on a mass piece; on the
other hand, the effect of two forces acting in opposite directions
From the comparison of the two measured force with the given
weight (force) ...
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