The fact that light can exert a pressure on matter suggests that it is made of particles called

photons

Explanation:

Light has dual nature. It behaves like waves sometimes and sometimes like particles. Interference and diffraction pattern show that light is a wave where as photoelectric effect shows that light behaves like particles. Light is composed of particles known as photons. A photon is a packet or quanta of energy. Light exerts pressure on matter. This suggests that light is made of particles. This is known as radiation pressure.

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

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it