Compare and contrast analog and digital signals by completing the following sentences. Pick more or less. NO LINKS!!! a signal that is continuously varying is

(More/less) reliable than a signal with limited possible values.

a signal stored on a vinyl record is

(More/less) easily copied than a signal stored in a computer.

a signal transmitted by the human voice loses

(More/less)energy as it travels than a signal transmitted by a fiber optic cable.

a clock that uses hands to tell the time is

(More/less) precise than a digital clock

which three statements are true about all alloys?

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.