# 10 All Homework Problems

- Given the amount of charge on a speck of dust and the number of protons, how many electrons are there?
- Common static electricity ranges from nanocoulombs to microcoulombs. How many electrons is this?
- Compare the momenta of elephants, humans, and tranquilizer darts!
- Assuming negligible air resistance, what is the final speed of a rock thrown from a bridge?
- How many DNA molecules can a single electron from an old-fashioned TV break?
- How long can you play tennis off a candy bar?
- How long for a car of fixed power to get up to speed?
- Which element has an outer electron with the lowest potential energy?
- Exploring the relationship between momentum and kinetic energy.
- What is the frequency of a stroboscope?
- Label the parts of a wave.
- If the frequency of a wave is changed, which of the other properties must also change assuming the speed of the wave remains fixed?
- Speed, wavelength, and frequency for sound.
- How long to collect a certain amount of sunlight?
- What is the power output of an ultrasound machine for a given intensity and area?
- Which situations will create electromagnetic radiation?
- Speed dependencies for electromagnetic waves.
- What is the frequency of a radio station given the wavelength?
- Rank the types of waves in the EM spectrum by wavelength.
- Find the momentum of a microwave photon.
- From momentum, calculate the wavelength and energy of a photon.
- An AM radio transmitter radiates some power at a given frequency. How many photons per second does the emitter emit?
- If the brightness of a beam of light is increased, the ________ of the _____________ will also increase.
- Determine the wavelength of the third Balmer line (transition from n = 5 to n = 2 ).
- Find the wavelength of a golf ball.
- Given an electron’s wavelength, what is its speed?