Questions from Modern Physics

Q: A camera with a 90-mm-focal-length lens

A camera with a 90-mm-focal-length lens is focused on an object 1.30 m from the lens. To refocus on an object 6.50 m from the lens, by how much must the distance between the lens and the sensor be cha...

Q: In one form of cataract surgery the person’s natural lens, which

In one form of cataract surgery the person’s natural lens, which has become cloudy, is replaced by an artificial lens. The refracting properties of the replacement lens can be chosen so that the perso...

Q: A certain very nearsighted person cannot focus on anything farther than 36

A certain very nearsighted person cannot focus on anything farther than 36.0 cm from the eye. Consider the simplified model of the eye described in Exercise 34.50. If the radius of curvature of the co...

Q: The average life span in the United States is about 70 years

The average life span in the United States is about 70 years. Does this mean that it is impossible for an average person to travel a distance greater than 70 light-years away from the earth? (A light-...

Q: An x ray with a wavelength of 0.100 nm collides

An x ray with a wavelength of 0.100 nm collides with an electron that is initially at rest. The x ray’s final wavelength is 0.110 nm. What is the final kinetic energy of the electron?

Q: X rays are produced in a tube operating at 24.0

X rays are produced in a tube operating at 24.0 kV. After emerging from the tube, x rays with the minimum wavelength produced strike a target and undergo Compton scattering through an angle of 45.0°....

Q: A photon with wavelength λ = 0.1385 nm scatters from

A photon with wavelength λ = 0.1385 nm scatters from an electron that is initially at rest. What must be the angle between the direction of propagation of the incident and scattered photons if the spe...

Q: If a photon of wavelength 0.04250 nm strikes a free

If a photon of wavelength 0.04250 nm strikes a free electron and is scattered at an angle of 35.0° from its original direction, find a. the change in the wavelength of this photon; b. the wavelength...

Q: The human eye is most sensitive to green light of wavelength 505

The human eye is most sensitive to green light of wavelength 505 nm. Experiments have found that when people are kept in a dark room until their eyes adapt to the darkness, a single photon of green li...

Q: A photon scatters in the backward direction (ɸ = 180°)

A photon scatters in the backward direction (ɸ = 180°) from a free proton that is initially at rest. What must the wavelength of the incident photon be if it is to undergo a 10.0% change in wavelength...