1. Doubling the f-number of a camera lens will change the light intensity admitt

Question

1. Doubling the f-number of a camera lens will change the light intensity admitted to the film by what factor? A) 8.0 B) 2.0 C) 0.25 D) 0.50 E) 4.0 2. What is the root mean square velocity of chlorine gas molecules at a temperature of 320K2(R-8.31x 10 J/kmole K, NA 6.02 x 10, and the molecular mass of Cl:-71) A) 4.7 x 10s m/s B) 0.8 x 10* m/s C) 1.7 x 10 m/s D) 3.3 x 102 m/s E) 1.l x 103 m/s 3. A 1 cm tall object is placed along the principal axis of a thin convex lens of 10 cm focal length. If the object distance is 30 cm, which of the following best describes the image distance and height, respectively? A) 12 cm and 0.69 B) 3.67 cm and 0.333 C) 30 cm and 0.337079 D) 32 cm and 0.3 E) 15 cm and 0.5 cm 4. If the distance between a point sound source and a dB detector is increased by a factor of 8, what will be the reduction in intensity level? A) 21.36N B) 29.016 N C) 10.9N D) 7.12N E) 18.06N 5. Diamond has an index of refraction of 2.419. What is the critical angle for internal reflection inside a diamond that is in air? A) 155 B) 105 C) 48.8 D) 24.4 E) 131

Explanation / Answer

1) (E) 4

2) (D) 3.3*10^2 m/s

Vrms = sqrt(3RT/M

= sqrt(3*8.31*10^3*320/71)

= 3.3*10^2 m/s

3) (E) 15 cm and 0.5cm

1/f = 1/u + 1/v

=> 1/v = 1/f – 1/u = 1/10 – 1/30

=> v = 15 cm

Hi/Ho = v/u

=> Hi/1cm = 15/30

=> Hi = 0.5 cm

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