Modern Physics

Question 1

At any T above absolute 0, matter emits an

Answer 1

Electromagnetic radiation

Question 2

What is the value for Planck’s constant (h)?

Answer 2

6.626E-34 or 4.14E-15

Question 3

What does the Photoelectric Effect state?

Answer 3

Light of a high frequency strikes a metal, which then emits electrons

Question 4

What is the threshold frequency fT?

Answer 4

The minimum frequency of light able to eject electrons

Question 5

The threshold frequency depends on the

Answer 5

Type of metal

Question 6

What is the equation for threshold frequency?

Answer 6

Work / h

Question 7

An electron is liberated only if

Answer 7

The energy is ≥ work

Question 8

What is the equation of energy?

Answer 8

E = h • f

Question 9

The equation of frequency equals

Answer 9

light / wavelength

Question 10

What is the equation for maximum KE of an electron?

Answer 10

KE = h • f - work

Question 11

Work is the

Answer 11

Minimum energy required to eject an electron

Question 12

What does the Bohr Model state?

Answer 12

There are stable orbits of quantized energy in which electrons maintain stability

Question 13

What is the equation of energy levels of electrons?

Answer 13

En = -13.6 / n^2

Question 14

∆E =

Answer 14

Ef - Ei

Question 15

What happens if -∆E?

Answer 15

There is emission

Question 16

What happens if +∆E?

Answer 16

There is absorption

Question 17

Fluorescence is the process by which

Answer 17

Certain substances emit visible light when excited by radiation of another wavelength

Question 18

UV radiation has a high frequency, meaning it has

Answer 18

Shorter wavelengths