Page 622 - SUBSEC October 2017_Neat

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17. Which of the following gives the correct 19. For light passing from air to Material X, the
relationship between the intensity and refractive index is 1.3 and for light passing
amplitude of sound waves? from air to Material Y, the refraction index
1 1 is 1.5. Which of the following shows the
(A) Intensity α amplitude speed of light in air, X and Y in descending
amplitude
order of magnitude? (fastest to slowest)

(B) Intensity α (amplitude) 2 (A) air, X, Y
(B) air, Y, X
(C) Y, air, X
1
(C) Intensity α (D) X, Y, air
amplitude 2
20. Light from a source is incident normally
(D) Intensity α amplitude on a diffraction grating which has 2000
lines per mm. What is the wavelength of

18. The displacement-time and displacement- the light if the first order maximum makes
distance graphs for a transverse wave are an angle of 300 with the zero order?
shown below.
(A) 125 nm
(B) 250 nm
(C) 433 nm
(D) 866 nm

21. A converging lens has a focal length of
12 cm. If an object is placed 20 cm from
the lens, the image would be

(A) 8 cm from the lens
(B) 12 cm from the lens
(C) 20 cm from the lens
(D) 30 cm from the lens

What is the wave speed?
22. The value of a possible wavelength for
(A) 0.25 m s -1 radiation in the visible region in the
(B) 0.5 m s -1 electromagnetic spectrum is
(C) 1.0 m s -1
-8
(D) 2.0 m s -1 (A) 5 x 10 m
(B) 5 x 10 m
-7
(C) 5 x 10 m
-6
(D) 5 x 10 m
-5

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