The wavelength of red helium-neon laser light in air is 632.8 nm.(a) what is its frequency? (b) what is its wavelength in glass that has an index of refractionof 1.48? (c) what is its speed in the glass?

(a)

The frequency of a wave is given by:

where

v is the wave's speed

is the wavelength

For the red laser light in this problem, we have

(speed of light)

Substituting,

(b) 427.6 nm

The wavelength of the wave in the glass is given by

where

is the original wavelength of the wave in air

n = 1.48 is the refractive index of glass

Substituting into the formula,

(c)

The speed of the wave in the glass is given by

where

is the original speed of the wave in air

n = 1.48 is the refractive index of glass

Substituting into the formula,

i think it’s a. this is because if they measured the mass of something with a mass of 150g, then their final answer would have to be approximately 150g. though all of their answers are almost 150, rosa and tran have the closest answers (or the exact answer) to the accurate one.

emily ruth's annual premium is $1058.50

step-by-step explanation:

emily ruth is a female of 27 years age purchasing 20 year endowment insurance with face value $25000.

from the given table,

for females, the age of a male 3 years younger should be used.

so, we have to check for 24 year male for 20 year endowment.

it is 42.34 for every $1000 face value.

for a face value of $25000,

it is 25 * 42.34 = $1058.50

∴ emily ruth's annual premium is $1058.50