Physics, 08.10.2019 03:30 galaxychild101

Which statement correctly compares sound and light waves?
both light and sound waves need matter to carry energy from one place to another.

neither light nor sound waves need matter to carry energy from one place to another.

light waves carry energy parallel to the motion of the wave, while sound waves carry energy perpendicular to it.

sound waves carry energy parallel to the motion of the wave, while light waves carry energy perpendicular to it.

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Answer from: chloeethoma24

D) Sound waves carry energy parallel to the motion of the wave, while light waves carry energy perpendicular to it.

Answer from: darrenturner

Answer : The correct option is, Sound waves carry energy parallel to the motion of the wave, while light waves carry energy perpendicular to it.

Explanation :

Sound waves are considered as longitudinal waves.

Light waves are considered as transverse waves.

Longitudinal waves are the waves in which the displacement of the particles is parallel to the motion of the waves.

Transverse waves are the waves in which the displacement of the particles is perpendicular to the motion of the waves.

Hence, the sound waves carry energy parallel to the motion of the wave, while light waves carry energy perpendicular to it.

Answer from: Quest

Sorry but what image

Answer from: Quest

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.

$_a^z\textrm{x}\rightarrow _{a-2}^{z-4}+_2^4\alpha$

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.

$_a^z\textrm{x}+_{-1}^0\textrm{e}\rightarrow _{z-1}^a\textrm{y}$

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 $\gamma -radiations$ . this process does not change the mass number.

$_a^z\textrm{x}^*\rightarrow _a^z\textrm{x}+_0^0\gamma$

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 $\beta ^+$ -decay. in this the mass number remains same.

$_a^z\textrm{x}\rightarrow _{z-1}^a\textrm{y}+_{+1}^0e$

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

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Which statement correctly compares sound and light waves?
both light and sound waves need mat...