1) A lamp emits light of frequency 5 c 10^15 HZ at a power of 25 W. The number o
ID: 1307110 • Letter: 1
Question
1) A lamp emits light of frequency 5 c 10^15 HZ at a power of 25 W. The number of photons given off per second is
a) 1.3 x 10^15 b.)8.3 * 10^17 c) 7.6*10^18 d) 1.7*10^23 e) 5 * 10^15
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2)light with a wavelength of 440 nm is used in a double slit experiment when the slits are 0.5 mm apart. If the screen is 1.5 m from the slits, the angular separation of the first orfer bright image is
a)0.05 b)0.1 c)0.15 d)0.2 e)5
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3) the glass plate (n = 15) are saperated by a thin round filament. when the top plate is illuminates with a light have a wavelength of 550nm. it is observed thatt the filament lies directly below the sixth bright fringe. the diameter of the filament is
a)1650 b)1788 C) 1238 D)1375 e)1512
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4)the image of an object 10 cm from a lens is located 10 cm behind the object. the focal length of the object is ?
Explanation / Answer
power P = Nhf
25 = N*6.625x10^-34*5x10^15
N = 0.754 x10^19 = 7.6 x 10^18 photons per sec
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2)
L = 440 x10^-9
a =0.5 x 10^-3 m
D = 1.5 m
from
y = mLD/a = 1*440*10^-9*1.5/0.5x10^-3 =0.2
d)0.2
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3)
6d = 15*550
d = 1375
D)1375
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4)
from 1/u + 1/v = 1/f
1/10 + 1/10 = 1/f
f = 5 cm
ALL THE BEST
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