Physics Midterm 2nd Term Grade 12

Front

What term is used to describe a perfect radiator and absorber of electromagnetic radiation?

Back

Blackbody

Front

What was the contradiction between observation and the classical electromagnetic theory prediction about blackbody radiation called?

Back

The ultraviolet catastrophe

Front

What were the units of light energy emitted by blackbody radiation originally called?

Back

Quanta

Front

What is the frequency of a photon with an energy of 1.99x10^-19 Joule?

Back

3x10^14 Hz

Front

What is the energy of a photon whose frequency is 6.0x10^20 Hz?

Back

2.5 MeV

Front

Light with an energy equal to three times the work function of a given metal causes the metal to eject photoelectrons. What is the ratio of the maximum photoelectron kinetic energy to the work function?

Back

2:1

Front

A monochromatic light beam with a quantum energy value of 3.0 eV is incident upon a photocell. The work function of the photocell is 1.6 eV. What is the maximum kinetic energy of the ejected electrons?

Back

1.4 eV

Front

According to the Rutherford model, what makes up most of the volume of an atom?

Back

Empty space

Front

In Rutherford’s experiment, why did the nucleus repel alpha particles?

Back

Electrostatic repulsion between the positively charged nucleus and alpha particles

Front

Which of the following is not a weakness of the Rutherford model of the atom? Options: The atom radiates energy continuously, The atom is unstable, The atom can’t produce spectral lines, The atom is mostly empty space

Back

The atom is mostly empty space