41. plastic bags thin sheets of plastic are used to make

items such as grocery bags. the sheets move under a

source of promethium-147, emitting beta particles. the

radiation intensity, measured under the plastic sheets,

is used to monitor the thickness of the plastic. during

this process, promethium changes into which element?

Promethium-147 changes into promethium-148.

Explanation:

Beta-decay: In this process, a neutron gets converted into a proton and an electron releasing a beta-particle. The beta particle released carries a charge of -1 units.  

During beta decay promethium-147 changes to promethium-148.

answer: option (4) is the correct answer.

explanation:

areas which are at low altitudes and near the equator tend to receive direct sunlight from the sun. hence, heat energy or radiations from the sun make these areas warmer and they have warmest water.

whereas areas which are at high altitudes and away from the equator do no receive direct sunlight. hence, no direct contact from the sun makes these regions colder and thus, they have colder water.

thus, we can conclude that the statement areas at low latitudes near the equator have the warmest water because they receive the most direct sunlight best explains the relationship between an area's geography and the temperature of its surface water.

idk i’m struggling too