Multiple Choice
How much energy does an individual photon of 470 nm light possess?
9. Quantum Mechanics
The Energy of Light
Back9. Quantum Mechanics
The Energy of Light
- Multiple ChoiceUltraviolet radiation and radiation of shorter wavelengths can damage biological molecules because they carry enough energy to break bonds within the molecules. A carbon-carbon bond requires 348 kJ/mol to break. What is the longest wavelength of radiation that can still break a carbon-carbon bond?
- Open Question
Hospital X-ray generators emit X-rays with wavelength of about 15.0 nanometers (nm), where 1nm = 10−9 m. What is the energy of a photon of the X-rays?
1views - Multiple ChoiceThe energy of a single photon is 2.441 × 10⁻²⁰ J. What is the energy of one mole of these photons, in kilojoules?
- Multiple ChoiceHow many photons are contained in a flash of green light (525 nm) that contains 189 kJ of energy?
- Multiple ChoiceWhat is the frequency of a photon emitted when an electron in a hydrogen atom transitions from n = 3 to n = 2? (R_H = 1.097 x 10^7 m^−1)
- Open Question
How are wavelength, frequency, and energy related for photons of light?
1views - Open QuestionCalculate the energy of a photon of electromagnetic radiation at each of the following wavelengths.1views
- Multiple ChoiceA laser pulse with a wavelength of 535 nm contains 4.85 mJ of energy. How many photons are in the laser pulse?1views
- Multiple ChoiceWhen Cu^{2+} ions in water absorb visible light, the absorbance typically occurs around a wavelength of 800 nm. What is the energy of this absorbance in electron volts (eV)?
- Multiple ChoiceWhich of the following occurs as the energy of a photon increases?
- Multiple ChoiceWhat is the source of energy that provides the boost for electrons during photosynthesis?
- Multiple ChoiceAssuming that radiation with λ = 15.0 cm is used, that all the energy is converted to heat, and that 4.184 J is needed to raise the temperature of 1.00 g of water by 1.00 °C, how many photons are necessary to raise the temperature of 250 g of water by 1.00 °C?
- Multiple ChoiceWhat is the energy in kJ/mol of infrared radiation with a wavelength of 1.51 × 10⁻⁶ m?
- Open Question
Calculate the energy of the orange light emitted, per photon, by a neon sign with a frequency of 4.89 × 1014 Hz.
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