Need asap how do scientist use the doppler effect to understand the universe

a. to determine the ages of plants
b. to determine plant composition
c. to determine light brightness
d. to determine motion of objects

maybe the spark is gone, love is a weird emotion and there is a possibility he may have found somebody else.

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm