As discussed in class, photons have energy, E = hc/λ, where h is Planck’s constant and λ is the wavelength.
(a) The wavelength sets the smallest distance that can be resolved by the photon. Why do particle physicists want to build higher-energy accelerators to study smaller distances? If h = 4.1357×10−15 eV s, what is the value of λ for E = 1012 eV?
(b) Estimate the number of photons per second emitted by an ordinary red light bulb. Assume λ = 600 × 10−9 m and 10% of the power is converted to visible light. Note that 1 eV = 1.6 × 10−19Joules.
As discussed in class, photons have energy, E = hc/λ, where h is Planck’s constant and...
The energy of a photon of light is given by E=hf where h=6.64x10-34 J∙s is the Planck constant and f is the frequency of the light. The photoelectric effect is the principle that underlies the operation of solar cells, for example the ones in your handheld calculator. Since photons of light have energy that depends on their frequency, different colours of light have different amounts of energy. Using the relationship between frequency (f), wavelength (λ), and the speed of light...
The equation for photon energy, E, is E=hcλ where h = 6.626×10−34 J⋅s (Planck's constant) and c = 2.99×108 m/s (the speed of light). What is the wavelength, λ, of a photon that has an energy of E = 3.39×10−19 J ? Express your answer numerically in meters.
3 (b) The energy of a Bohr atom in the n-th excited state is given by the formula E--a2mc2 2,7, where α-e2/(4πέρ,10hc)-1 /137, m is the electron mass and e denotes the electron electric charge. i) Why is the total energy negative? Explain briefly your answer. ii) What is the radius of the electron in the n-th excited state in the Bohr atom? To answer that correctly follow the next steps Use Bohr's angular momentum quantization principle to obtain an...