Hi , this is physics work and there are 2 videos to watch to do the VL 11

VL 11 - Electromagnetic Radiation We began this course studying electric charges, the electric field they generate, and the electric force they feel from external electric fields. We continued by examining the magnetic field generated by moving electric charges and the force external magnetic fields generate on other moving electric charges. We continued this thought process on how electric and magnetic fields can interact in our study of “light” or electromagnetic radiation. Refer to your text if you need a refresher.

1) Draw a representation of a light wave traveling to the right in the space below. Indicate the oscillating electric and magnetic fields. What is the direction of polarization of the EM wave you drew?

2) Now consider this wave and let it pass through a polarizing filter oriented with its polarization axis parallel to the

polarization of the wave you have drawn above. How much of the wave passes through the filter? How does your answer change if the polarization axis of the filter and the wave are 45 degrees apart?

3) List some types of common electromagnetic radiation including microwaves, radio waves, x-rays, and the visible spectrum in order of wavelength from smallest to largest in the space below. Indicate the direction of increasing frequency with an arrow. How is the energy per photon related to the wavelength and frequency in the electromagnetic spectrum?

A black body or blackbody is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. The name "black body" is given because it absorbs all colors of light. A black body also emits black-body radiation.

A black body in thermal equilibrium (that is, at a constant temperature) emits electromagnetic black-body radiation. The radiation is emitted according to Planck's law, meaning that it has a spectrum that is determined by the temperature alone (see figure at right), not by the body's shape or composition.

Real materials emit energy at a fraction—called the emissivity—of black-body energy levels. By definition, a black body in thermal equilibrium has an emissivity ε = 1. In astronomy, the radiation from stars and planets is sometimes characterized in terms of an effective temperature, the temperature of a black body that would emit the same total flux of electromagnetic energy.

4) Please navigate to the Blackbody Radiation PHET here: https://phet.colorado.edu/sims/html/blackbody- spectrum/latest/blackbody-spectrum_en.html

a) At what wavelength does the earth emit? Would we say it glows?

b) At what wavelength does the lightbulb emit? Would we say it glows?

c) Though we hold our sun in unique regard it is in fact a very average star. What color would be describe it as? What is the “color” of the star Sirius A?