lesson 5

Question 1

The word quantum comes from the Latin word “quantus”, which means

Answer 1

how much, amount, or quantity

Question 2

Max Plank, a German theoretical physicist discovered the energy of quanta(plural of quantum). This is now known as

Answer 2

The quantum mechanics (Quantum Theory of Mechanics)

Question 3

which is the branch of physics which
pertains to anything that is very small.

Answer 3

The quantum mechanics (Quantum Theory of Mechanics)

Question 4

is the speed of something in a given
direction.

Answer 4

Velocity

Question 5

amount of space between two things,
points, lines or the state of being apart in space of one thing from another.

Answer 5

Distance

Question 6

is the ongoing sequence of events taking place in the past, present and future.

Answer 6

Time

Question 7

It refers to the distance between two
successive wave crests or throughs.

Answer 7

WAVELENGTH(λ)

Question 8

measure of wavelength

Answer 8

1 Å = 10 -10 m
Å = angstrom
1 nm = 10 -9 m
nm = nanometer
1 m = 1,000 mm
1 m = 100 cms.

Question 9

It refers to the number of waves passing a
particular point in a unit of time.

Answer 9

FREQUENCY(υ)

Question 10

measures of frequency

Answer 10

1 Hz = 1 cycle/s = 1 1/s
Hz = hertz
1 kHz = 1,000 Hz
1 MHz = 1,000,000 Hz

Question 11

It refers to the distance travelled by EM
radiation per unit time.

Answer 11

VELOCITY(V)

Question 12

measures of velocity

Answer 12

• speed of EM radiation in a vacuum or
  free space = 3 x 108 m/s
  = 3 x 1010 cm/s
  = 300,000 km/s
  = 186,000 mi/s

Question 13

As the frequency increases, the

Answer 13

wavelength decreases.

Question 14

It states that the photon energy is directly
proportional to the photon frequency.

Answer 14

PLANCK’S QUANTUM THEORY (QUANTUM
THEORY OF MECHANICS)

Question 15

It states that matter can be transformed into
energy or vice versa.

Answer 15

THEORY OF RELATIVITY