7. The size of a light wave is the distance between two successive \"wave crests

Question

7. The size of a light wave is the distance between two successive "wave crests." This the distance between two points of max intensity of the light wave. What is the name for this "size" of a light wave? equally means See sections 3-12 to 3-18 in Chapter 3. Answer these questions: 8. Using your knowledge of Wien's law or the discussion of heating an iron rod in the textbook, if an object gets hotter, what change do we see to the color of its glow (meaning its wavelength)? (A) The glow gets bluer (shorter wavelengths) 9. Using your knowledge of the Stefan-Boltzmann law, what happens to the brightness of a glowing (B) The glow gets redder (longer wavelengths) object as it gets cooler? (A) It gets brighter (emitting more energy) (B) It gets dimmer (emitting less energy) 10. If you spread the light of the Sun (or any source of light) out into many colors and dark lines appear in it, what are the dark lines called? (Any bright lines would go by a different name) 11. An atom has positive protons and negative electrons, usually in equal amounts. But, if there are either too few electrons or too many electrons, the atom overall will be positive or negative. What's the word for that type of atom? 12. Electrons can have certain energy levels when they are part of an atom. If they have the lowest possible energy, then they are in the "ground state." Higher energy levels would be called "excited states." If an electron drops from a higher energy level to a lower energy level, the energy that is lost will be emitted as what?

Explanation / Answer

7. Wavelength - The distance between two successive points having highest amplitude is called as wavelength. Since here the distance between two points of max intensity is 'Size' its equivalent to Wavelength.

8. A) The glow gets bluer (Shorter Wavelength). Every objects emits the electromagnetic radiation and the wavelength depends on temperature. The cold objects emits there energy with longer wavelength radiation and hot objects emits there energy with shorter wavelength.

9. It gets dimmer (emitting less energy). The radiant heat energy is directly proportional to the temperature (T4), so the lesser the temperature the lesser the radiant heat energy and lesser the energy the radiation will be lesser. so the emission will be less.

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