Physics, 25.07.2019 12:00 eweqwoewoji

Which statement about convection is correct? a. convection occurs when a heated particle comes in contact with another particle, transferring heat. this transfer of heat can occur in solids, liquids, or gases. b. convection occurs when a heated particle comes in contact with another particle, transferring heat. this transfer of heat can only occur in solids, not liquids or gases. c. convection occurs when heated particles of a material flow toward areas having more thermal energy. this movement of particles can only occur in liquids, not gases or solids. d. convection occurs when heated particles of a material flow toward areas having less thermal energy. this movement of particles can only occur in gases and liquids, not solids.

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Convection occurs when heated particles of a material flow toward areas having more thermal energy. This movement of particles can only occur in liquids and gases not solids.

Explanation:

Convection occurs when heated particles of a material flow toward areas having more thermal energy. This movement of particles can only occur in liquids and gases not solids.

Convection is one of the three modes of heat transfer. It is the transfer of heat caused by fluid (which can be liquid or gas)movement from one particle to another. There is presence of intervening medium between particles. Convection occurs only in liquids. Example is the transfer of heat from a hot food in a thermoflask to the base of its cork. It leads to formation of water droplets at the base of the cork.

Answer from: Quest

the answer would be c

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 about convection is correct? a. convection occurs when a heated particle comes in c...

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