Which describes a scenario in which the doppler affect is occurring the volume increases the pitch changes from low to high the pitch changes from high to low the volume decreases

The pitch changes from high to low

Explanation:

Doppler effect occurs when there is change of pitch caused by either a moving sound source and a stationary observer.

Doppler effect is the change in wavelength or frequency of a sound source relative to the movement of an observer.

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.

this means that the temperature of both substances will be equal