Photon Energy and Light Properties

This video tutorial explores the visible light spectrum, focusing on the relationship between wavelength, frequency, and energy. It explains how to identify colors based on their wavelengths and frequencies, and demonstrates calculations for determining the frequency and energy of photons. Practical applications, such as the energy requirements for LEDs, are also discussed, providing a comprehensive understanding of light properties.

Which color of light has the longest wavelength?

• Green

• Yellow

• Blue

• Red

What is the wavelength of red light approximately?

• 300 nm

• 500 nm

• 690 nm

• 400 nm

Which color of light has the highest frequency?

• Red

• Yellow

• Green

• Blue

What is the formula to calculate frequency from wavelength?

• f = c / λ

• f = c * λ

• f = λ / c

• f = λ * c

What is the frequency of a photon with a wavelength of 460 nm?

• 5.00 x 10^14 Hz

• 6.52 x 10^14 Hz

• 3.00 x 10^8 Hz

• 1.00 x 10^12 Hz

What is Planck's constant value used in energy calculations?

• 6.626 x 10^-34 J·s

• 3.00 x 10^8 m/s

• 1.60 x 10^-19 J

• 9.81 m/s^2

How much energy does a photon of blue light with a wavelength of 460 nm have in electron volts?

• 1.5 eV

• 2.7 eV

• 2.0 eV

• 3.0 eV

What is the minimum voltage required to power a blue LED?

• 1.5 volts

• 2.7 volts

• 2.0 volts

• 3.5 volts

What is the energy of a red photon with a wavelength of 625 nm in electron volts?

• 2.5 eV

• 1.5 eV

• 1.99 eV

• 3.0 eV

What is the relationship between light frequency, wavelength, and energy?

• Frequency is inversely proportional to energy

• Energy is inversely proportional to frequency

• Energy is directly proportional to frequency

• Wavelength is directly proportional to energy