AFNS — AFNS Physics

Waves


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#17

Snell law n1 sin i =:

A) n2 sin r

B) n2 cos r

C) n1 cos i

D) sin r only

Answer:   A
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#18

Refractive index n equals:

A) c/v

B) v/c

C) f lambda

D) 1 always

Answer:   A
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#19

Total internal reflection when:

A) Angle > critical and denser to rarer

B) Any angle

C) Rarer to denser only

D) Normal incidence

Answer:   A
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#20

Diffraction is:

A) Bending around obstacles

B) Only reflection

C) Only absorption

D) Only polarization

Answer:   A
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#21

Interference needs:

A) Coherent sources

B) Random phases only

C) Single frequency forbidden

D) No waves

Answer:   A
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#22

Constructive interference path difference:

A) n lambda

B) lambda/2 odd

C) Zero only

D) Random

Answer:   A
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#23

Destructive interference path diff:

A) (n+1/2) lambda

B) n lambda

C) Zero only

D) 2 lambda always

Answer:   A
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#24

Young double slit proves:

A) Light wave nature

B) Particle only

C) No interference

D) Sound only

Answer:   A
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