Chapter 5
Solution.1
Velocity of light in air = 186,282 miles / sec or 299,792 km/s
Light speed = 670,616,629 mph.
Hence the lights can transverse 7.5 times round the Earth in a second. (Redd)
Solution.2
Highest energy to lowest energy Sequence:
a. Gamma rays
b. X-rays
c. Ultraviolet rays
d. Red visible light
e. Blue visible light
f. Infrared rays
g. Radio waves
Solution.3
(a) All the mentioned light waves above are having same speed in the medium of air (c=
3 ×108 m/s). Consequently, the proportion of the velocity of ultraviolet and
infrared waves is 1:1.
(b)In the air, all mentioned light waves travel on similar velocity without any difficulty
considering the wavelength or regularity. Gamma emission has a minor wavelength
and higher frequency, radio emission has a minor frequency and higher wavelength.
So, gamma rays, X-rays, and microwaves which travel in the air have similar speeds
but different wavelengths.
(c) For Yellow visible light, the wavelength is 570-590nm, and for Blue visible light, the
wavelength is 450-495nm. So yellow visible light is the fastest through the vacuum.

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Velocity Related Problem and Its Solution

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