What is the wavelength of the radio waves from a station broadcasting at 91.5 MH

Question

What is the wavelength of the radio waves from a station broadcasting at 91.5 MHz (91.5 times 10^6 Hz)? In general X-rays have wavelength between 10 nm and 0.01 nm. For an X-ray with a wavelength of 5 nm, what is the corresponding frequency? A fish lies 64 cm below the surface of a clear pond. If the index of refraction of water is assumed to be 1.33 and that of air is approximately 1, how far below the surface does the fish appear to a person looking down from above? A insect is embedded inside a glass block (n = 1.5) so that it is located 2.7 cm below a plane surface of the block. How far from this surface does this insect appear to a person looking at the block? A positive lens has a focal length of 15 cm. An object is located at a distance of 3 cm. a) How far from the lens is the image? b) Is the image real or virtual, erect or inverted? A negative lens has a focal length of -12 cm. An object is located 32 cm from the lens. a) How far from the lens is the image? b) Is the image real or virtual, erect or inverted? A concave mirror has a focal length of 18 cm. An object is located 6 cm from the surface of the mirror. a) How far from the mirror is the image of this object? b) Is the image real or virtual, upright or inverted?

Explanation / Answer

(2) We know that the
wavelength = speed/frequency = 3*108 / (91.5*106) =3.2787 m
(4) Wavelength = 5nm = 5*10-9 m
  Frequency = speed/wavelength = 3*108/(5*10-9) = 6*1016 Hz
E2.
Assuming sin i = tani
and Sin r = tan r
And using concept of real and apparent depth
n1 tan i = n2 tan r
where n1 = 1.33 and n2 = 1
1.33 (x/64) = (x/y)
y = 64/1.33 = 48.12 cm

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