Questions from Modern Physics

Q: A 100-W incandescent light bulb has a cylindrical tungsten filament

A 100-W incandescent light bulb has a cylindrical tungsten filament 30.0 cm long, 0.40 mm in diameter, and with an emissivity of 0.26. a. What is the temperature of the filament? b. For what wavelen...

Q: Determine λm , the wavelength at the peak of the Planck distribution

Determine λm , the wavelength at the peak of the Planck distribution, and the corresponding frequency ƒ, at these temperatures: a. 3.00 K; b. 300 K; c. 3000 K.

Q: Radiation has been detected from space that is characteristic of an ideal

Radiation has been detected from space that is characteristic of an ideal radiator at T = 2.728 K. (This radiation is a relic of the Big Bang at the beginning of the universe.) For this temperature, a...

Q: Two stars, both of which behave like ideal blackbodies, radiate

Two stars, both of which behave like ideal blackbodies, radiate the same total energy per second. The cooler one has a surface temperature T and a diameter 3.0 times that of the hotter star. a. What...

Q: The brightest star in the sky is Sirius, the Dog Star

The brightest star in the sky is Sirius, the Dog Star. It is actually a binary system of two stars, the smaller one (Sirius B) being a white dwarf. Spectral analysis of Sirius B indicates that its sur...

Q: A pesky 1.5-mg mosquito is annoying you as

A pesky 1.5-mg mosquito is annoying you as you attempt to study physics in your room, which is 5.0 m wide and 2.5 m high. You decide to swat the bothersome insect as it flies toward you, but you need...

Q: A 10.0-g marble is gently placed on a

A 10.0-g marble is gently placed on a horizontal tabletop that is 1.75 m wide. a. What is the maximum uncertainty in the horizontal position of the marble? b. According to the Heisenberg uncertainty...

Q: A scientist has devised a new method of isolating individual particles.

A scientist has devised a new method of isolating individual particles. He claims that this method enables him to detect simultaneously the position of a particle along an axis with a standard deviati...

Q: a. The x-coordinate of an electron is measured with

a. The x-coordinate of an electron is measured with an uncertainty of 0.30 mm. What is the x-component of the electron’s velocity, vx , if the minimum percent uncertainty in a simultaneous measurement...

Q: A small tropical fish is at the center of a water-

A small tropical fish is at the center of a water-filled, spherical fish bowl 28.0 cm in diameter. a. Find the apparent position and magnification of the fish to an observer outside the bowl. The eff...