An optical fiber is made with core material of index of refraction 1.30 . The fiber is clad with a material of index 1.50 . What is the critical angle for this fiber?
a. 53.1°
b. 56.4°
c. 60.1°
d. With these indices, there is not critical angle.
D
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The biggest obstacle to life being present in the atmospheres of Jupiter and Saturn is the
A) absence of liquid water in their atmospheres B) high levels of solar radiation that would destroy any biological molecules C) strong vertical wind speeds that would rapidly carry organisms into the hot interior where they would be destroyed D) very low temperatures at the tops of the clouds where water would not be liquid
A string of length 2.5 m is fixed at both ends. When the string vibrates at a frequency of 85 Hz, a standing wave with five loops is formed
(a) Determine the distance between two adjacent nodes. (b) Determine the wavelength of the waves that travel on the string. (c) Determine the speed of traveling waves on this string. (d) Determine the fundamental frequency of this string.
Answer Question 3 using January as the date
What happens to the magnitude of the magnetic field inside a long solenoid the length of the solenoid is doubled, with the number of turns remaining the same?
1.It becomes four times larger. 2.It becomes twice as large. 3.It is unchanged. 4.It becomes one-half as large. 5.It becomes one-fourth as large.