Ans: Beat frequency =
= 4HzExplanation: The beat frequency is equal to the absolute value of the difference in frequency of the two waves. In other words, the number of beats per second is equal to the difference in frequency. It is due to the destructive and constructive interference. <span>According to this interference, sound will be soft or loud.
Hence. the formula is:
</span>Beat frequency =

<span>
Since,
</span>


Therefore,
Beat frequency =

=> Beat frequency =

-i
For velocity vs Time graphs, the displacement of the object from 2 seconds to 6 seconds is 30 m.
<h3>What is displacement?</h3>
The displacement is the shortest distance travelled by the particle. It is the vector quantity which re[presents both the magnitude and direction.
In velocity time graphs, the displacement is the area under the curve of the graph on the x axis.
'
A line starts at (0, 2) and ends at (6, 8) in v-t graph
Displacement is equal to the area of a triangle and a rectangle formed under the line.
Area = 1/2 base x height + length x breadth
Area = 1/2 x 6x 6 + 6x2
Area = 18 +12
Area = 30 m
Thus, the displacement is 30 m.
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In this problem, it is necessary to introduce the atomic number Z into the equation.
E=(2.18×10^-18 J)(Z^2 )|1/(ni^2 )-1/(nf^2 )| E=(2.18×10^-18 J)(2^2 )|1/(6 ^2 )-1/(4 ^2 )|=3.02798×10^-19 J
Plug the E value calculated into the equation: (wavelength is always positive)
E=hc/λ 3.02798×10^-19 J=hc/λ λ=6.56×10^-7 m
656 nm is in the visible spectrum
The path difference between two waves is the distance between the two waves. This distance may be obtained as the product of the order of the maxiuma or minima and the wavelength of the wave. The formula is:
d*sin∅ = nλ
Substituting the values for the distance between slits and the angle:
nλ = 0.05 * sin(0.25)
nλ = 2.18 x 10⁻⁴ m
The path difference is 0.2 millimeters.
Based on Kepler’s work, the statement best describes the orbit of a planet around the Sun is an ellipse with the Sun at one focus. Last option is correct.
<h3>What is Kepler's first law of planetary motion?</h3>
Kepler's first law of planetary motion states that the planets revolve around the sun in orbits elliptical in shape with the Sun at its one of the focus.
This implies that the period for a planet to orbit the Sun increases with the radius of its orbit.
Given is the solar mass of the Sun is 1. The orbital period of Jupiter is 11.9 Earth years.
As the planets rotate around the Sun, the relative distance between the Sun and planets increases and decreases.
So, Sun is place at one of the focus of the elliptical orbit in which any planet moves around the Sun.
Thus, last option is correct.
Learn more about Kepler's first law of planetary motion.
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