If a spectral line from a distant star is measured to have a wavelength of 497.15 nm, but is normally at 497.22 nm how fast (speed, not velocity) with respect to the earth is the star moving in m/s

The speed is 42210 m/s.

Explanation:

Given that,

Normally wavelength

Observed spectral line

We need to calculate the change in wavelength

Using formula of wavelength

We need to calculate the value of z

Using formula for z

Put the value into the formula

We need to calculate the speed

Using formula of speed

Put the value into the formula

Hence, The speed is 42210 m/s.

the answer is b, have negligible mass

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