2. What do radio waves, infrared radiation, visible light, ultraviolet radiation
ID: 3510264 • Letter: 2
Question
2. What do radio waves, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays have in common? How do they differ?
3. What is a black body? What are the main characteristics of the radiation it emits?
4. How do astronomers use the Doppler Effect to determine the velocities of astronomical objects?
5. What are the differences between light waves and sound waves?
6. Explain why we have to observe stars and other astronomical objects from above Earth’s atmosphere in order to fully learn about their properties.
7. What is the normal condition for atoms? What is an excited state of atom?
8. Why do excited atoms absorb and reemit radiation at characteristic frequencies?
Explanation / Answer
2) Similarities between radio waves, infrared radiation, visible light, ultraviolet radiation, x- rays and gamma rays are
Differences:
3) BLACK BODY:
Black body is defined as an object that absorbs all the radiation falling on it at all wavelength is called as black body. When the black body is at uniform temperature the emission has a charecteristic frequency distribution which depends on the temperature. These emission is called as black- body radiation.
4) The astronomers use the doppler effect to calculate the accurate speed of the stars and other objects that are moving towards or away from the earth.
The doppler shift is used to calculate precisely how fast the astronomical objects are moving.
5) The differences between ligth waves and sound waves are as follows:
2. They travel through the vaccum
3. Do not require a medium
2. They travel through the solids, liquids, or gases.
3. Requires a medium.
7) The normal condition of an atom is in the normal condition the number of electrons in an atom are equals to the number of protons in the nuclues.
When the atom is in excited state it absorbs energy from the outside source and moves to higher energy orbit.
8) The excited atoms absorb and reemit radiation at characteristic frequencies because when the atoms excited they absorb radiation. The electrons jump as a level and when the electrons reemit the energy the electrons goes on down. The different energy levels take different frequencies to move so the excited atoms absorb and reemit radiation at characteristic frequencies
LIGHT WAVES SOUND WAVES 1. Light waves are transverse waves 1. Sound waves are longitudinal waves
2. They travel through the vaccum
3. Do not require a medium
2. They travel through the solids, liquids, or gases.
3. Requires a medium.
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