Answer:
a
Explanation:
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when observer and source moves relative to each other then the frequency received by the observer is different from the real frequency
This apparent change in frequency due to relative motion is known as Doppler's effect.
Here we know that
here we know that
= real frequency
v = speed of sound
= speed of observer
= speed of source
so this is known as Doppler's Effect
Answer:
Explanation:
From the question we are told that:
Time 
Generally the Period is given as
Therefore difference in frequency dF
Assuming a perpetual inventory system and using the weighted average method, the weighted average unit is determined as $11.44 after the October 22 purchase.
<h3>What is Weighted Average Cost (WAC)?</h3>
The Weighted Average Cost (WAC) method of inventory valuation in accounting uses a weighted average to establish the COGS and inventory levels.
The price of the products up for grabs is divided by the quantity of them in the weighted average cost technique.
The WAC technique is appropriate under both GAAP and IFRS accounting. Weighted Average Cost (WAC) Method Formula
<h3>Weighted Average Cost</h3>
Weighted Average Unit Costs = [360 units×$12 + (320-180) ×$10] / [360+(320-180)]units}
Weighted Average Unit Costs = $5720 / 500 units
Weighted Average Unit Costs = $11.44
Costs of goods that are offered for sale are calculated using beginning inventory value plus acquisitions.
Units available for sale are the number of units that can be sold by a company or the total number of units that are in its inventory.
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Answer:
I. They come from sources across space
II. They travel in a straight line from their source.
III. They can be reflected by some types of material.
Explanation:
Light wave can be defined as an electromagnetic wave that do not require a medium of propagation for it to travel through a vacuum of space where no particles exist.
The following statements about light waves are true;
I. They come from sources across space.
II. They travel in a straight line from their source.
III. They can be reflected by some types of material. reflection occurs when a ray of light or wavefronts bounces off a smooth surface. Thus, when light hit a surface, it bounces back to the medium from which it was originally propagated with.
However, light waves cannot travel through all type of material except materials that are transparent or translucent but not opaque.
