In a Compton scattering experiment, the scattered photon has a wavelength of 6.55 pm. If the scattering angle is what is the energy of the incident photon?

A. 1.43 MeV
B. 218 keV
C. 380 keV
D. 117 keV
E. 66.3 keV

B. 218 keV

Physics & Space Science

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John is nearsighted and cannot see things beyond 90 cm from his eyes. What is the refractive power of the contact lenses that will enable him to see distant objects clearly?

A) +1.1 diopters B) -1.1 diopters C) -1.7 diopters D) -2.2 diopters E) +2.2 diopters

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A +20-nC point charge is placed on the x axis at x = 2.0 m, and a ?25-nC point charge is placed on the y axis at y = ?3.0 m. What is the direction of the electric field at the origin?

a. 209° b. 61° c. 29° d. 241° e. 151°

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Debris disks are cold dust disks around main-sequence stars that are produced by collisions among planetesimals

a. True b. False Indicate whether the statement is true or false

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From shortest to longest wavelength, which of the following correctly orders the different categories of electromagnetic radiation?

A) infrared, visible light, ultraviolet, X-rays, gamma rays, radio
B) radio, infrared, visible light, ultraviolet, X-rays, gamma rays
C) visible light, infrared, X-rays, ultraviolet, gamma rays, radio
D) gamma rays, X-rays, ultraviolet, visible light, infrared, radio
E) gamma rays, X-rays, visible light, ultraviolet, infrared, radio

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Physics & Space Science