Warm Front: advancing warm air displays cold air along a warm front develops a gradual boundary slope as an illustrated in figure 12.8 a warm front can cause widespread light precipitation on a weather map a red line with evenly space red semi-circle pointing in the direction of the front movement indicates a warm front. Stationary Front: stationary front is when two air masses meet but neither advances the boundary between them stalls this front is sanity is stationary front as shown figure 12.8 frequently occurs between two modified air masses that have small temperature and pressure graduates between them the air masses can continue moving parallel to the front station area fronts sometimes have light winds precipitation and line of evil space represents a sanitary front on a weather map.

Describe the difference between a stationary front and a warm front?

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Explanation:

answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.