Questions from College Physics

Q: Find the speed of an electron having a de Broglie wavelength equal

Find the speed of an electron having a de Broglie wavelength equal to its Compton wavelength.

Q: A 2.0 - kg object falls from a height of

A 2.0 - kg object falls from a height of 5.0 m to the ground. If the change in the object’s kinetic energy could be converted to visible light of wavelength 5.0 x 10-7 m, how many photons would be pro...

Q: An x - ray tube is operated at 5.00 x

An x - ray tube is operated at 5.00 x 104 V. (a) Find the minimum wavelength of the radiation emitted by this tube. (b) If the radiation is directed at a crystal, the first - order maximum in the refl...

Q: Figure P27.45 shows the spectrum of light emitted by a

Figure P27.45 shows the spectrum of light emitted by a firefly. (a) Determine the temperature of a blackbody that would emit radiation peaked at the same frequency. (b) Based on your result, explain w...

Q: Johnny Jumper’s favorite trick is to step out of his 16th -

Johnny Jumper’s favorite trick is to step out of his 16th - story window and fall 50.0 m into a pool. A news reporter takes a picture of 75.0 - kg Johnny just before he makes a splash, using an exposu...

Q: Photons of wavelength 4.50 x 102 nm are incident on

Photons of wavelength 4.50 x 102 nm are incident on a metal. The most energetic electrons ejected from the metal are bent into a circular arc of radius 20.0 cm by a magnetic field with a magnitude of...

Q: An electron initially at rest recoils after a head - on collision

An electron initially at rest recoils after a head - on collision with a 6.20 - keV photon. Determine the kinetic energy acquired by the electron.

Q: Radio waves from a star, of wavelength 2.50 x

Radio waves from a star, of wavelength 2.50 x 102 m, reach a radio telescope by two separate paths, as shown in Figure P24.13. One is a direct path to the receiver, which is situated on the edge of a...

Q: A light source of wavelength λ illuminates a metal and ejects photoelectrons

A light source of wavelength λ illuminates a metal and ejects photoelectrons with a maximum kinetic energy of 1.00 eV. A second light source of wavelength λ /2 ejects photoelectrons with a maximum kin...

Q: Red light of wavelength 670. nm produces photoelectrons from a certain

Red light of wavelength 670. nm produces photoelectrons from a certain photoemissive material. Green light of wavelength 520. nm produces photoelectrons from the same material with 1.50 times the maxi...