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Physics

Chapter 1 - Electric Current, Ohms Law and Kirchhoffs Laws

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Chapter 2 - Magnetic Effects of Electric Current and Measuring Instruments

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Chapter 3 - Electromagnetic Induction and AC Dynamo and Transformer

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Chapter 4 - Alternating Current AC Circuits

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Chapter 5 - Dual Nature of Wave and Particle

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Chapter 6 - Atomic Spectra and X-Rays

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Chapter 7 - Lasers and Principles

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Chapter 8 - Modern Electronics and Semiconductors

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Quiz

Lesson 1: Laser Physics, Population Inversion and the Helium-Neon Laser — Lesson quiz

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  • Questions count: 5
  • Passing grade: 60%
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1.
What is the primary role of helium atoms in the Helium-Neon gas laser mixture?
To emit the laser beam directly
To act as a semi-transparent mirror
To cool down the discharge tube
To transfer excitation energy to neon atoms via inelastic collisions
2.
The hydrostatic pressure exerted by a static homogeneous liquid of density rho at depth h beneath its free surface is expressed by:
P = rho * g / h
P = rho * g * h
P = rho * h / g
P = 1/2 rho * g * h2
3.
A diver descends to a depth of 30 meters in seawater (density = 1030 kg/m3. If atmospheric pressure is 1.013 x 105 Pa and g = 9.8 m/s2, the total absolute pressure experienced by the diver is approximately:
3.03 x 105 Pa
1.01 x 105 Pa
6.06 x 105 Pa
4.04 x 105 Pa (approx. 4.0 atmospheres)
4.
Pascal's principle states that when pressure is applied to an enclosed, incompressible fluid, it is transmitted:
Undiminished to every portion of the fluid and to the walls of the containing vessel
With an exponential decay as distance increases
Strictly to compressible gases
Only downwards towards the bottom of the vessel
5.
In a hydraulic press, the ratio of the cross-sectional area of the large piston to that of the small piston is 50. If a force of 100 N is exerted on the small piston, the maximum force exerted by the large piston is:
5000 N
2 N
2500 N
50,000 N
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