Minimun uncertainty

Estimate the minimum uncertainty in energy that corresponds to the uncertainty in time of 1x10^-12sec.

Energy and quantum level

What is the energy of the photon emitted when the electron of a hydrogen atom makes a transition from the quantum level n=3 to the level n=1?

Photon emission during transition

The electron of a hydrogen atom is initially at the orbit n=4. If this electron first goes to the orbit n=3 and then to the orbit n=2 and then to the orbit n=1, how many photons are emitted during these transitions? How many photons are emitted if the electron directly falls from the orbit n=4 to the orbit n=1?

Energy to ionize a hydrogen atom

What is the minimum amount of energy needed to ionize a hydrogen atom in its n=2 state?

Max wavelength if a photon and ionization

Find the maximum wavelength of the photon that a hydrogen atom in its ground state must absorb in order for the ionization to occur.

Frequency and hydrogen atom transition

Find the frequency of the light that corresponds to a transition in the hydrogen atom from the n=7 state to the n=2 state.

Wavelength and hydrogen atom transition

What is the wavelength of the photon emitted by a hydrogen atom during a transition between the quantum levels n=4 and n=2?

Rotational Motion and Angular Displacement, Angular Velocity and Angular Acceleration

A Ferris wheel rotates at an angular velocity of 0.24 rad/s. Starting from rest, it reaches its operating speed with an average angular acceleration of 0.030 rad/s^2. How long does it take the wheel to come up to operating speed?

Inelastic collision causes loss of momentum. What are two physical reasons for the loss?

In physics lab we collided two objects that then both started moving in the same direction. We measured the velocities through two photo gates. We know momentum was lost because the velocities decreased after the collision. What are two physical reasons for the loss of momentum?

The Conservation of Energy

A skier coasts down a very smooth, 10-m-high slope (v =20 m/s), what is his speed at the bottom of the slope. If the skier has a mass of 60kg and the force of friction retards his motion by doing 2500 j of work, what is his speed at the bottom of the slope?