Question

i need the answers to all of them

Blue light is emitted when electrons in a substance make a particular energy – level transition. If yellow light were emitted instead from the same substance, the light would correspond (a) a greater change of energy in the atom (b) a lesser change of energy in the atom (c) none of the above

Red light is emitted when electrons in a substance make a energy – level transition. If BLUE light were emitted instead from the same substance, the light would correspond (a) a greater change of energy in the atom (b) a lesser change of energy in the atom (c) none of the above

3. Fluorescent materials are noteworthy because upon de-excitation they emit visible light after being are excited by (a) visible radiation (b) microwave radiation (c) x-rays (d) ultraviolet radiation

4. Assume the wavelength of a red photon is about double that of violet light. How does the energy E of a red photon compare with the energy of a violet photon? a) The energy is twice the energy of a violet photon b) The energy is one half the energy of a violet photon c) same energy

5. Assume the wavelength of a blue photon is about half that of red light. How does the energy of a blue photon compare with the energy of a red photon?

a. The energy is twice the energy of a red photon

b. The energy is one half the energy of a red photon

c. same energy

6. In this problem, assume the frequency of the light is above the threshold required to kick electrons out of the metal. In the photoelectric effect, the higher the wavelength of the illuminating light on the photosensitive surface, the lower the

a. number of ejected electrons

b. kinetic energy of ejected electrons

c. none of the above

7. One electron travels with twice the speed of another. Which has the higher wavelength? (a) the faster electron (b) the slower electron (c) wavelengths are the same

Answer 1

1) Blue light is emitted when electrons in a substance make a particular energy – level transition. If yellow light were emitted instead from the same substance, the light would correspond to a lesser change of energy in the atom because the wavelength follows an order of VIBGYOR , that is blue has a lower wavelength as compared to yellow light and hence lesser change of energy is required to produce yellow (greater wavelength) as compared to blue light(lower wavelength).

2)

Red light is emitted when electrons in a substance make a energy – level transition. If BLUE light were emitted instead from the same substance, the light would correspond to a greater change of energy in the atom because the wavelength follows an order of VIBGYOR , that is blue has a lower wavelength as compared to red light and hence greater change of energy is required to produce blue (smaller wavelength) as compared to red light(greater wavelength).

3) Fluorescent materials are noteworthy because upon de-excitation they emit visible light after being are excited by ultraviolet radiation which is present in excess in the atmosphere.

4) Assume the wavelength of a red photon is about double that of violet light. The energy E of a red photon compare with the energy of a violet photon is one half.the energy of violet photon because wavlength and energy are inversely related to each other.

5) Assume the wavelength of a blue photon is about half that of red light. the energy of a blue photon compared with the energy of a red photon- The energy is twice the energy of a red photon because wavlength and energy are inversely related to each other.

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