Einstein: I argued that light is a collection of tiny discrete particles called photons! Do you know the mass of a photon? a) Photons do not have mass b) Photons have the same mass as electrons c) A photon's mass depends on its color d) A photon's mass depends on the light source

Einstein: I argued that light is a collection of tiny discrete particles called photons! Do you know the mass of a photon? a) Photons do not have mass b) Photons have the same mass as electrons c) A photon's mass depends on its color d) A photon's mass depends on the light source

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter11: Particle Physics And Cosmology

Section: Chapter Questions

Problem 86CP: The peak intensity of the CMBR occurs at a wavelength of 1.1 mm. (a) What is the energy in eV of a...

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The peak intensity of the CMBR occurs at a wavelength of 1.1 mm. (a) What is the energy in eV of a 1.1-ram photon? (b) There are approximately 109 photons for each massive particle in deep space. Calculate the energy of 10^ such photons, (c) If the average massive particle in space has a mass half that of a proton, what energy would be created by converting its mass to energy? (d) Does this imply that space is "matter dominated”? Explain briefly.
The light from a heated atomic gas is shifted in frequency because of the random thermal motion of light-emitting atoms toward or away from an observer. Estimate the fractional Doppler shift (f/f0), assuming that light of frequency f0 is emitted in the rest frame of each atom, that the light-emitting atoms are iron atoms in a star at temperature 6000 K, and that the atoms are moving relative to an observer with the mean speed =8kBTm Must we use the relativistic Doppler shift formulas f=f01/c1/c for this calculation? Such thermal Doppler shifts are measurable and are used to determine stellar surface temperatures.
Interstellar space is filled with radiation of wavelength 970µn. This radiation is considered to be a remnant of the “big bang.” What is the corresponding blackbody temperature of this radiation?
(a) Calculate the wavelength of a photon that has the same momentum as a proton moving at 1.00% of the speed of light. (b) What is the energy of the photon in MeV? (c) What is the kinetic energy of the proton in MeV?
Suppose a proton is moving at 1.25 % of the speed of light. a)Calculate the wavelength, in meters, of a photon that has the same momentum as this proton. b) What is the energy of the photon, in megaelectron volts? c) What is the kinetic energy of the proton, in megaelectron volts?
7. Borg ships are cubical. A Borg ship is approaching earth. According to an observer on earth, the Borg ship is 1000 m high, 1000 m wide, and has a depth of 200 m. Earth launches a photon torpedo to destroy the Borg ship. The torpedo is launched from earth with a velocity of 0.99. The torpedo was set on earth to go off in 2 hr. 09 ce 1000 m Earth 200m a) With what velocity is the Borg ship approaching earth? b) What is the speed of the torpedo as measured by an observer on the Borg ship? ) According to an observer on the Borg ship, how long will it take the torpedo to explode?
A photon of X-ray has energy of 1 keV. A photon of visible radiation has energy of 3 eV. In this context, which one of the following statements is not correct? A) The wavelength of X-ray photon is less than the wavelength of visible radiation photon. B) Both the photons have different energies. C) The speeds of both the photons in vacuum are different D) The frequency of X-ray photon is higher than the frequency of visible radiation photon.
3 In a galaxy far, far away (redshift z = 5.0) an electron and a positron collide and annihilate, producing two photons. The collision is nonrelativistic and the center of mass frame of the collision is at rest with cosmic expansion. An instrument mounted on an orbiting telescope with an effective diameter of 2.0 cm detects one of the photons. How accurately can the celestial position of the collision be determined?
1If an electron moves from n = 5 to n = 1, what wavelength of light is emitted? (h = 6.626 x 10-34, 1 eV = 1.6 x 10-19 J) 4008 nm 434 nm 95 nm 1281 nm 2Which of the following best describes a frame of reference? an experiment that proved that Earth did not have an aether wind the theory that describes the behavior and characteristics of objects moving at relativistic speeds the effect of the slowing of time as an object moves with high speeds a point in which someone relates the behavior of an object from one perspective professor can you answer the 2 questions please
what is the De-Broglie wavelength of a proton accelerated through a potential difference of 2kV a.) 0.65 x 10 ^ -13 m b.) 0.65 x 10 ^ -10 m c.) 0.65 x 10 ^ -11 m d.) 0.65 x 10 ^ -20 m
What is the energy (in Joules, J) and color associated with 532-nm light? Energy and Type of EM Radiation A) 3.74×10-19 J Red (Visible, close to IR range) B) 3.74×10-19 J Violet (Visible, close to UV range) C) 3.74×10-19 J Green (Visible, middle of visible range) D) 3.74×10-28 J Colorless (Radio) E) 2.68×10+18 J Colorless (Gamma)
Electrons are accelerated in television tubes through a potential difference of about 1.50 x 104 V. Find the wavelength of the electromagnetic waves emitted. The X-ray wavelength ranges from 0.01 nm to 10 nm. Will the EM waves produced qualify as X-rays? Briefly explain your answer.