This lecture introduces the concepts of quantization of atoms and the Bohr model. It covers electromagnetic waves, the electromagnetic spectrum, and blackbody radiation. The photoelectric effect is explained, highlighting light's dual nature. The lecture also demonstrates how to calculate photon energy using wavelength and frequency. It discusses line spectra and how they help identify elements. The Bohr model is introduced, explaining quantized energy levels and electron transitions. The lecture concludes with a summary of key concepts.

What is the speed of electromagnetic waves?

• 1.5 x 10^8 meters per second

• 5.0 x 10^8 meters per second

• 2.998 x 10^8 meters per second

• 3.0 x 10^8 meters per second

Which phenomenon demonstrates the dual nature of light?

• Blackbody radiation

• Photoelectric effect

• Bohr model

• Electromagnetic spectrum

How is the energy of a photon calculated?

• By multiplying Planck's constant with the frequency

• By adding the speed of light to the wavelength

• By dividing the speed of light by the frequency

• By multiplying Planck's constant with the wavelength

What type of spectrum is emitted by a blackbody?

• Emission spectrum

• Absorption spectrum

• Continuous spectrum

• Line spectrum

How can we identify elements in a star?

• By analyzing its temperature

• By measuring its distance

• By observing its brightness

• By examining its line spectra

What does the Bohr model explain about electrons?

• They do not emit light

• They have quantized energy levels

• They have continuous energy levels

• They can exist at any energy level

In the Bohr model, what happens when an electron absorbs energy?

• It moves to a lower energy level

• It moves to a higher energy level

• It emits light

• It remains in the same energy level

What is the quantum number 'n' used for in the Bohr model?

• To determine the speed of light

• To measure temperature

• To calculate the wavelength

• To describe energy levels

What is the value of the constant 'k' in the Bohr model for hydrogen?

• 1.602 x 10^-19 joules

• 9.109 x 10^-31 joules

• 6.626 x 10^-34 joules

• 2.179 x 10^-18 joules

What is the relationship between energy levels and distance from the nucleus in the Bohr model?

• Energy increases with distance

• Energy is unrelated to distance

• Energy remains constant

• Energy decreases with distance