Chemistry 9B Revision

He tried to explain the behavior of light by assuming that light consists of particles.

• Schrodinger

• Newton

• Einstein

• Hertz

It is a wave’s height from zero to the crest.

• hertz

• amplitude

• frequency

• Wavelength

It is the distance between the crests, and represented by Greek letter lambda.

• hertz

• amplitude

• frequency

• Wavelength

It is the number of wave cycles to pass a given point per unit of time.

• hertz

• amplitude

• frequency

• Wavelength

The light given off by an electric discharge through sodium vapor is ____.

• a continuous spectrum

• an emission spectrum

• of a single wavelength

• white light

Emission of light from an atom occurs when an electron

• drops from a higher to a lower energy level.

• jumps from a lower to a higher energy level.

• moves within its atomic orbital.

• falls into the nucleus.

The atomic emission spectra of a sodium atom on Earth and of a sodium atom in the sun would be

• the same.

• different from each other.

• the same as those of several other elements.

• the same as each other only in the ultraviolet range.

What is the formula to get the unknown of wavelength?

• c= λv

• λ= c/v

• λ= v/c

• λ= cv

As the frequency of light increases, the wavelength

• increases

• remains the same.

• decreases

• approaches the speed of light.

According to the Heisenberg uncertainty principle, if the position of a tiny moving particle is known,

• mass of the particle cannot be exactly determined.

• charge of the particle cannot be exactly determined.

• spin of the particle cannot be exactly determined.

• velocity of the particle cannot be exactly determined.