51. The intensity ratio of waves is 25 : 9. What is the ratio of their amplitudes?
52. The velocity of sound in air
53. Infrasonic sound has a frequency lower than
54. When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to :
55. Quality of a musical note depends on
56. If a band is played on the moon the sound will
57. The shape of our milky way galaxy is
58. The colours of stars depend on their
59. The substance which conducts current in the solid state is
60. Electric current is measured by which instrument?
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