Question

(1)(A)A laser used in eye surgery has a power of 1.38 W and the wavelength of the light is 517 nm. If during a surgical process, the laser is focused on the retina of an eye for 0.031 s, determine the number of photons incident on the retina.

(B)Through what minimum potential difference (in kV) must electrons at rest be accelerated so that on striking a target they produce x-ray photons with a momentum of 1.11 keV/c? Through what minimum potential difference (in V) must electrons at rest be accelerated so that they acquire a momentum of 1.11 keV/c?

(C)In Millikan's oil-drop experiment, a 515-V potential difference is applied to plates separated by 2.30 cm. What is the mass of an oil drop (in kg) having two extra electrons that is suspended motionless by the field between the plates? What is the diameter of the drop (in m), assuming it is a sphere with the density of olive oil (9.20 ✕ 10² kg/m³).

Answer 1

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