Reflection and Refraction of Light Waves

http://www.walter-fendt.de/ph14e/huygenspr.htm

Refraction of light

http://www.walter-fendt.de/ph14e/refraction.htm

鈷-60

Cobalt-60 (Co-60) is a radioactive isotope of cobalt. Due to its short half life of 5.27 years. Co-60 is not found in nature. It is produced artificially by neutron activation of Co-60.

Co-60 decays by negative beta decay to the stable isotope nickel-60 (Ni-60). The activated Ni-atom emits two gamma rays with energies of 1.17 and 1.33 MeV.

The β-decay energy is low and easily shielded. Both strong γ-lines are of same magnitude therefore Co-60 is used as a γ-ray source with an energy around 1.3 MeV.

Main uses for Co-60:
*As a tracer for cobalt in chemical reactions,
*Sterilization of medical equipment,
*Radiation source for medical radiotherapy,
*Radiation source for industrial radiography,
*Radioactive source for leveling devices and thickness gauges,
**As a radioactive source for food irradiation and blood irradiation, and
*As a radioactive source for laboratory use.

Brownian Motion of Smoke Particles at MC 2007

Cupping Therapy For Lower Back Pain

java - magnetic field of a bar magnet

Magnetic field of a bar magnet
http://www.walter-fendt.de/ph14e/mfbar.htm

java - radioactivity decay

radioactivity decay
http://www.walter-fendt.de/ph14e/lawdecay.htm

Rutherford Model of an Atom

Rutherford

Temperature.m4v

Carbon Dating

Gases

Kinetic Molecular Theory

Ideal Gas Equation: PV=nRT

Brownian motion HD

Brownian Motion of Smoke Particles

Motions of Gas Molecules

Central Limit Theorem

Swine Flu - A9 H1N1 - Why it is Mild

The H1N1 Swine Flu: A Look Inside

human development

Binary fission Euglena

White Blood Cell Chases Bacteria

Bacterial asexual reproduction (binary fission)

cell division

Microscopic View of Ear Mites in Pets

Microscopic View of 5 uL Pond Water

Amoeba Feeds!

MicroscopicWorld2

MicroscopicWorld1

Onion cell magnification

Bacteria Growth

Cell Division

Direct Current Electric Motor

Magnetic field in a solenoid

What is the magnetic field?

TomoTherapy - Revolutionary Radiation Therapy

Medical Imaging News: Here Come Laser X-Rays

how x ray Works

3D Medical Animation - What is Cancer?

Critical Angle Lab

Visible Spectrum 可見光譜

Rainbow 彩虹

From continuous refraction to total internal reflection

Total internal reflection 全內反射

Total internal reflection of right-angled prisms 直角稜鏡的全內反射

Measuring the focal length of a lens 量度焦距

Flying Magic 飛行魔術

Image of a plane mirror 平面鏡的成像

Simple Gas Laws

Rutherford's Experiment: Nuclear Atom

Type of radioactive particles

Absorbing radioactivity - for beginners

Differentiating Alpha, Beta and Gama Waves

Radioactive decay equations.mov

Radon Found In Countertops

Balloon under a vacuum

Physics: Wave Speed

Charles Law experiment

Gas volume and pressure

Pressure & Temperature Demonstration

Pressure-Volume Relation ( Kinetic Molecular Theory )

Nuclear Fussion

Nuclear Fission Animated

Cloud Chamber

Types of Radiation from Radioactive Decay

http://www.youtube.com/watch?v=vuGvQjCOdr0

Types of Radioactive Decay + Penetrating power

Microwave Diffraction 微波的繞射

Interference of waves on the surface of water HD

The Infamous Double Slit Experiment

Convection Currents

Heat or Thermal Conductivity

水的汽化比潛熱Specific latent heat of vaporization of water

水的熔解比潛熱Specific latent heat of fusion of water