By J. O. Bird and P. J. Chivers (Auth.)
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10-10 -10-^ -io-« Ultra violet -10-^ -10^ [Visible light -10-5 -10-· -10-^ Infra red -10-2 Microwaves -10-· -1 -10· -10^ -10^ -10* -10' Short radio waves Medium radio waves Long radio waves are related by the following equation where ν is the velocity of the sound; X is the velocity of the source; y is the velocity of the observer. All three velocities are measured in the same direction. 5 kHz. If the velocity of sound is 330 m s~' then the observed frequency is given by: (v-y) observed frequency = (true frequency) (v-x) (3 3 0 ^ j 330—0 \ from which.
2 shows the arrangement. T h e source of light is focussed by the lens Lj at S. In the time it takes the light to travel from S, via the lenses L2 and L3 to the mirror Μ and back via L3 and to the toothed wheel the latter has rotated so that tooth a now interrupts the light and the light source is eclipsed. 72 miles. Ϊ. 2 distance. 133x 10^ m s~'. 000003) x 10» m s"*. 6 T h e s p e e d o f w a v e s depends on the properties of the medium through which they travel. (i) T h e speed of transverse waves in strings or springs is given by ν = ^/(ΤΙμ) where Τ is the tension a n d μ is the mass per unit length of the string or spring.
Ii) T h e incident ray, the normal at the point of incidence and the reflected ray all lie in the same plane. 2. A ray of light from O strikes a plane mirror at an angle of 4 5 ° at point P. Since from the laws of reflection the angle of incidence i is equal to the angle of reflection r then t = r = 4 5 ° . T h u s angle O P ( i = 9 0 ° and the light is reflected through 90°. T h e ray then strikes another mirror at 45° at point Q . T h u s a = b = 45°, angle P Q R = 90° a n d the light ray is again reflected through 90°.