Mastering Atomic Theory: Key Formulas in Light and Energy

This video tutorial reviews essential formulas in atomic theory, including those for wavelength, frequency, speed of light, and energy of a photon. It explains the photoelectric effect, De Broglie wavelength, and photon emission from hydrogen atoms. The video also provides practical examples and conversion factors for calculations.

What is the formula to calculate the speed of light using wavelength and frequency?

• C = Lambda + new

• C = Lambda * new

• C = Lambda / new

• C = new / Lambda

How is the energy of a photon calculated using frequency?

• E = frequency / H

• E = H * frequency

• E = H / frequency

• E = H + frequency

What is the conversion factor from nanometers to meters?

• 1 nanometer = 1 * 10^-12 meters

• 1 nanometer = 1 * 10^-3 meters

• 1 nanometer = 1 * 10^-6 meters

• 1 nanometer = 1 * 10^-9 meters

In the photoelectric effect, what is the kinetic energy of an ejected electron equal to?

• Work function minus energy of incoming photon

• Energy of incoming photon minus work function

• Energy of incoming photon plus work function

• Energy of incoming photon times work function

What is the formula for calculating the maximum wavelength needed to free an electron from a metal?

• Max wavelength = speed of light / Plank's constant

• Max wavelength = Plank's constant / speed of light

• Max wavelength = Plank's constant * speed of light / threshold energy

• Max wavelength = threshold energy / Plank's constant

How do you convert work function from electron volts to joules?

• Divide by 1.62 * 10^-19

• Multiply by 1.62 * 10^-19

• Divide by 1.62 * 10^19

• Multiply by 1.62 * 10^19

What is De Broglie's wavelength formula?

• Wavelength = speed / (Plank's constant * mass)

• Wavelength = mass / (Plank's constant * speed)

• Wavelength = Plank's constant / (mass * speed)

• Wavelength = Plank's constant * mass * speed

What happens when an electron in a hydrogen atom falls from a higher energy level to a lower one?

• It remains stable

• It gains energy

• It absorbs radiation

• It emits radiation

How is the energy of an emitted photon from a hydrogen atom calculated?

• E = 2178 * 10^-8 * (1/n_final^2 - 1/n_initial^2)

• E = -2178 * 10^8 * (1/n_final^2 - 1/n_initial^2)

• E = -2178 * 10^-8 * (1/n_final^2 - 1/n_initial^2)

• E = 2178 * 10^8 * (1/n_final^2 - 1/n_initial^2)

What is the mass of a proton?

• 1.6726 * 10^-27 kg

• 1.6726 * 10^-31 kg

• 9.11 * 10^-31 kg

• 1.6749 * 10^-27 kg