Photon Energy and Wavelength Concepts

The video tutorial covers various problems related to the photon model and electromagnetic spectrum. It begins with calculating the energy of a photon of visible light and an x-ray photon, using Planck's constant and wavelength. The tutorial then explores the response of rhodopsin to photon energy, determining the maximum wavelength for a given energy. It also calculates the number of photons in a UV laser pulse. The relationship between temperature and peak wavelength is discussed, using examples of stars and glowing filaments. Finally, the video examines photon energies in medical x-ray imaging, comparing different applications.

What is the energy of a photon with a wavelength of 500 nanometers in electron volts?

• 4.5 eV

• 3.5 eV

• 2.5 eV

• 1.5 eV

How is the energy of a photon related to its frequency?

• Energy is the square of frequency

• Energy is directly proportional to frequency

• Energy is inversely proportional to frequency

• Energy is independent of frequency

What is the energy of an x-ray photon with a wavelength of 1 nanometer in electron volts?

• 200 eV

• 500 eV

• 1500 eV

• 1200 eV

What is the maximum wavelength of electromagnetic radiation that can cause a transition in rhodopsin?

• 500 nm

• 750 nm

• 690 nm

• 600 nm

In which part of the spectrum does the maximum wavelength for rhodopsin fall?

• Ultraviolet

• Visible

• Infrared

• Microwave

How many photons are contained in a UV laser pulse with an energy of 0.5 millijoules?

• 4.85 x 10^23 photons

• 1.85 x 10^23 photons

• 3.85 x 10^23 photons

• 2.85 x 10^23 photons

What is the temperature of a filament with a peak wavelength of 1200 nanometers in Celsius?

• 2144°C

• 2244°C

• 2444°C

• 2344°C

What is the temperature of a star with a peak wavelength of 400 nanometers?

• 8300 K

• 5300 K

• 6300 K

• 7300 K

What is the frequency of a dental x-ray photon with an energy of 25 keV?

• 9 x 10^18 Hz

• 8 x 10^18 Hz

• 7 x 10^18 Hz

• 6 x 10^18 Hz

What is the wavelength of a photon used in microtomography with an energy 2.5 times greater than a dental x-ray?

• 30 pm

• 40 pm

• 20 pm

• 10 pm