Wave Nature of Electromagnetic Radiation

Question 1

Electromagnetic Radiations (EMR)

Answer 1

Radiation emitted by oscillating bodies

Question 2

EMR Characteristics

Answer 2

• Propagates in form of wave
• Oscillating electric and magnetic fields produced are perpendicular to direction of propagation of wave
• Does not need medium for propagation
• Can be of multiple types, combined together forms Electromagnetic Spectrum

Question 3

Properties of EMR

Answer 3

1) Frequency
2) Wave length
3) Wave number

Question 4

Wave Length

Answer 4

• Distance between 2 succesive crests or 2 succesive troughs
• Unit - cm or m

Question 5

Frequency

Answer 5

*No. of waves passing through point of space per unit time ( 1 second)
*Unit - Hertz (Hz)

Question 6

Wave Number

Answer 6

*No. of waves per unit length
*Unit - cm^-1 or m^-1

Wave Number = (1/ Wave Length)

Question 7

Particle Nature of EMR

Answer 7

1) Blackbody radiation
2) Photoelectric effect
3) Variation of heat capacities as a function of temperature
4) Line Spectra of atoms

Question 8

Blackbody Radiation

Answer 8

• Ideal body which emits or absorbs all types of radiation