What was the major shortcoming in the classical prediction of blackbody radiation that led us to the idea of quantization of light (light treated as particles )? A. Classical theory failed to explain radiations altogether. B. Classical theory failed to explain the absorption of light by any blackbody. C. Classical theory failed to explain the emission of radiation by any blackbody. D. Classical theory failed to explain the experimental results of blackbody radiation and predicted a rapid increase in the intensity with frequency of light causing ultraviolet catastrophe. E. None of the above.

According to the theory of Photoelectric effect, the energy of a photon depends on its frequency. Which one will have highest energy of a photon? A. red light B. yellow light C. green light D. blue light E. all have the same energy

Which of the following statements about a black body are true? Select one or more: a.The spectrum of the cosmic background radiation corresponds with great accuracy to the radiation of a black body at a temperature of 2.7 K. b.A black body absorbs all the radiation that hits it, and emits no radiation at all. c.According to Planck's radiation law (black body distribution), the wavelength corresponding to the maximum energy density of the radiation decreases (and the frequency increases) as the temperature increases. d.A black body reflects all the radiation that hits it, and absorbs no radiation at all.

1.What is the wavelength of an hydrogen atom moving with a mean velocity corresponding to the average kinetic energy of hydrogen atoms under thermal equilibrium at 293K? 2.The speed of an electron is measured to be 1 km/s with an accuracy of 0.005%. Estimate the uncertainty in the position of the particle 3.Determine the maximum wavelength shift in the Compton scattering of photons from protons 4.Calculate the de Broglie wavelength of electrons and protons if their kinetic energies are i) 1% and ii) 5% of their rest mass energies.

A photon of light has a frequency of 5.00 x 1014 Hz. If the frequency of the photon was doubled then which of these would happen to the energy of this photon?   a. it would become one-fourth as much   b. it would become half as much   c. it would double   d. it would quadruple   e. it would triple

6. Given that the work function for a certain metal surface is 2.3 eV, find the stopping potential for photoelectrons ejected using incident light frequency of 7.0x1014 Hz. A. 0.9 volts B. 0.8 volts C. 0.3 volts D. 0.6 volts

The photoelectric effect provided evidence that supported the early suggestion by Max Planck that electromagnetic waves exist as discrete packets of energy. a. Describe the energy transformations that occur during the photoelectric effect. b. If the incident light was not causing the emission of any electrons from the target metal, how could the light be changed to start causing emission of electrons? Explain your answer. c. Rather than changing the light source, explain why changing the target metal from part (c) may allow for the detection of emitted electrons.

The work function of cesium is 2.1 eV. ▾ Part A Determine the lowest frequency photon that can eject an electron from cesium. Express your answer with the appropriate units. Templates Symbols undo' rego Teset keyboard shortcuts Help Value Units Request Answer Part B Determine the maximum possible kinetic energy in electron volts of a photoelectron ejected from the metal that absorbs a 320-nm photon. Express your answer in electronvolts. Templates Symbols undo' redo Teset keyboard shortcuts Help Kmax= eV f= Submit

How is the frequency of light related to its ability to produce the photoelectric effect? A. Low-frequency light does not produce the photoelectric effect. B. The frequency of the light is not related to the photoelectric effect C. High-frequency light does not produce the photoelectric effect D. All frequencies of light produce the photoelectric effect

a. What is the energy in joules associated with photons that have a wavelength matching thatof the color blue in the visible spectrum? b. Repeat part (a) for the color red. c. Do the results confirm the fact that the shorter the wavelength the higher the energy level? d. Is light in the ultraviolet range more dangerous in regard to skin cancer than those in theinfrared range? Why? e. Can you guess why fluorescent lights are used for growing plants in a dark environment?