Questions from College Physics

Q: Photons with a wavelength of 400 nm are incident on an unknown

Photons with a wavelength of 400 nm are incident on an unknown metal, and electrons are ejected from the metal. However, when photons with a wavelength of 700 nm are incident on the metal, no electron...

Q: Rank the flywheels in order of angular speed, largest to smallest

Rank the flywheels in order of angular speed, largest to smallest. Explain.

Q: It takes longer to hard-boil an egg in Mexico City

It takes longer to hard-boil an egg in Mexico City (2200 m above sea level) than it does in Amsterdam (parts of which are below sea level). Why? [Hint: At higher altitudes, water boils at less than 10...

Q: Two identical pucks are on an air table. Puck A has

Two identical pucks are on an air table. Puck A has an initial velocity of 2.0 m/s in the +x-direction. Puck B is at rest. Puck A collides with puck B, and A moves off at 1.0 m/s at an angle of 60° ab...

Q: An air ionizer filters particles of dust, pollen, and other

An air ionizer filters particles of dust, pollen, and other allergens from the air using electric forces. In one type of ionizer (see diagram), a stream of air is drawn in with a speed of 3.0 m/s. The...

Q: Refer to Fig. 20.2. The rod has length

Refer to Fig. 20.2. The rod has length L and its position is x at some instant, as shown in the figure. Express your answers in terms of x, L, v, B (the magnetic field magnitude), and R, as needed. (...

Q: An alpha particle (helium nucleus, charge +2e) starts

An alpha particle (helium nucleus, charge +2e) starts from rest and travels a distance of 1.0 cm under the influence of a uniform electric field of magnitude 10.0 kV/m. What is the final kinetic energ...

Q: A raindrop inside a thundercloud has charge −8e. What is

A raindrop inside a thundercloud has charge −8e. What is the electric force on the raindrop if the electric field at its location (due to other charges in the cloud) has magnitude 2.0 × 106 N/C and is...

Q: Unpolarized light is incident on four ideal polarizing sheets with their transmission

Unpolarized light is incident on four ideal polarizing sheets with their transmission axes oriented as shown in the figure. What percentage of the initial light intensity is transmitted through this s...

Q: If diffraction were the only limitation on resolution, what would

If diffraction were the only limitation on resolution, what would be the smallest structure that could be resolved in an electron microscope using 10 keV electrons?