Waves

Question 1

What is a transverse wave ?

Answer 1

• A transverse wave is one that vibrates at right angles to the direction in which it is moving – perpendicular

Question 2

What is a longitudinal wave ?

Answer 2

Vibrations are along the direction in which the wave is moving .

Question 3

Relation between frequency and wavlegth

Answer 3

Inverse

Question 4

What is doppler effect ?

Answer 4

o * Doppler effect – apparent change in frequency which occur when a source of waves is moving When the object is still, the wave fronts are evenly spaced and have the same frequency
o The direction it moves in ,the waves will be compressed
o Shorter wavelength and frequency

Question 5

Property of waves

Answer 5

– able to reflect ,refract and Doppler effect .

Question 6

Property of EM waves

Answer 6

– all transfer energy ,all transverse waves ,travel at 300,000,000 m/s ,all reflected and refracted .(4)

Question 7

What is refractive index and critical angle ?

Answer 7

• Refractive index – different materials bend rays of light by different amounts
• Critical angle – angle of incidence in the denser medium in which the angle of refraction is 90 degrees

Question 8

Conditions of TIR

Answer 8

o Travel from dense to less dense
o Incidence greater than critical angle

Question 9

How do optical fibres work ?

Answer 9

• The fibers are very narrow ,light entering the inner core always strikes at an angle greater than critical angle

Question 10

Diasdvanatges and advanatgess of EM waves

Answer 10

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