Chapter 27. Quantum Physics. Need for Quantum Physics. Problems remained from classical mechanics that relativity didn’t explain Blackbody Radiation The electromagnetic radiation emitted by a heated object Photoelectric Effect Emission of electrons by an illuminated metal Spectral Lines
A beam of blue light and a beam of red light each carry atotal energy of 2 500 eV. If the wavelength of the red lightis 690 nm and the wavelength of the blue light is 420 nm,find the number of photons in each beam.
A certain light source is found to emit radiation whose peakvalue has a frequency of 1.00 × 1015 Hz. Find the temperatureof the source assuming that it is a blackbody radiator.
When a certain metal is illuminated with light of frequency3.0 × 1015 Hz, a stopping potential of 7.0 V isrequired to stop the most energetic ejected electrons.What is the work function of this metal?
What wavelength of light would have to fall on sodium(with a work function of 2.46 eV) if it is to emit electronswith a maximum speed of 1.0 × 106 m/s?
What minimum accelerating voltage would be required toproduce an x-ray with a wavelength of 0.030 0 nm?
A beam of 0.68-nm photons
undergoes Compton scatteringfrom
free electrons. What are the energy
and momentumof the photons that
emerge at a 45° angle with respect
to the incident beam?
Calculate the de Broglie wavelength of a proton movingat (a) 2.00 × 104 m/s; (b) 2.00 × 107 m/s.
A 0.200-kg ball is released from rest at the top of a 50.0-mtall building. Find the de Broglie wavelength of the balljust before it strikes the Earth.
A 50.0-g ball moves at 30.0 m/s. If its speed is measuredto an accuracy of 0.10%, what is the minimum uncertaintyin its position?