Answer:
140 Hz
Explanation:
Frequency is the reciprocal of period hence f=1/T
Here, the frequency is 140 times per second hence the period will be 1/140= 0.0071428571428 s
Rounded off to 3 significant figures then the period is 0.00714 s or 0.714 ms
Otherwise, the frequency is already given as 140 cycles per second which is equivalent to 140 Hz
Answer : 96 candelas
Explanation : Luminous intensity is a quantity of light that is emitted by a light source with a solid angle in a particular direction.
We know the formula of luminous intensity
Luminous intensity = illuminance x distance from light source



So, the intensity of the source will be 96 candelas.
Answer:
bro the way you worded it makes no since
Your answer would be D, Hydroelectric power
<h3><u>Answer;</u></h3>
- In a freshwater lake
- In the atmosphere
- In Earth's mantle
<h3><u>Explanation</u>;</h3>
- <em><u>Convection currents are types that cause the process of convection, which the transfer of heat energy that occurs in fluids.</u></em>
- <em><u>Convection currents are circular patterns that occurs in fluids such that the less dense warm fluids rises up while denser cold fluids sinks, </u></em>it is this movement of less dense warm fluid and denser cold fluids that creates circular patterns that causes the process of convection to take place.
- <em><u>Convection currents may occur in the atmosphere where warm air rises while cold denser air sinks or moves towards the bottom, it may also occur in the mantle of the Earth and water or water bodies such as lakes.</u></em>