Gr-09....Quiz-02....Preparation

Who proposed the Quantum Mechanical Model?

• Sir Isaac Newton

• Max Planck

• Niels Bohr

• Schrodinger

What is the unit of frequency, which is equal to one cycle per second?

• Joule (J)

• Hertz

• Newton

• Pascal

What happens when an electron absorbs energy?

• It moves to a lower energy level

• It remains in its ground state

• It loses energy

• It jumps to a higher energy level

What describes the motion of larger bodies?

• Quantum mechanics

• Classical mechanics

• Heisenberg principle

• Electromagnetic radiation

What is the phenomenon in which electrons are ejected when light shines on a metal?

• Lyman series

• Paschen series

• Bohr effect

• Photoelectric effect

Frequency and wavelength are ______________ proportional to each other

• Inversely

• Directly

All light rays have the ______________ wavelengths and frequencies.

• Same

• Different

The ____ is the height of a wave's crest or depth of the trough.

• Amplitude
• Frequency

• Wavelength

• Hertz

If you want to see an electron, you need to strike it with a ____, but it will affect its speed and direction.

• Another electron

• Photon

• Nucleus

What is the Heisenberg Uncertainty Principle?

• It states that it is impossible to know both the velocity and position of a particle at the same time.

• It states that it is possible to know both the velocity and position of a particle at the same time.