Define wave length . write its SI unit❌dont spam anyone ❌

1.	Define wave length . write its SI unit❌dont spam anyone ❌
Answer» Wavelength : It is defined as the distance travelled by a wave during the time a PARTICLE of the medium completes one vibration. It is denoted by k. Its SI unit is METRE. Frequency: It is the NUMBER of occurrences of a repeating event per unit of time. Its SI unit is Hertz (Hz).HOPE THIS IS HELPFUL TO YOUPLEASE FOLLOW ME DEARTHANK MY ANSWER MATE PLEASEAND MARK THIS AS BRAINLIEST PLEASE

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Guys...this may seems to be hard...bt no...it's not...I need to know the solution of only part:-(d) & (e)(a)The moment of inertia of a disc of radius 0.5 m about its geometric axis is 2kg-m2. If a string is tied toits circumference and a force of 10 Newton is applied, the value of torque with respect to this axis will be(1) 2.5 N-m21275 N-m(3) 10 N-m(4) 20 N-m(b)In the above question, if the disc executes rotatory motion, its angular acceleration will be :-(1) 2.5 rad/sec(2) 5 rad/sec(3) 10 rad/sec(4) 20 rad/sec(c)In the above question, the value of its angular velocity after 2 seconds will be :-(1) 2.5 rad/sec(2) 5 rad/sec(3) 10 rad/sec(4) 20 rad/sec(d)In the above question, the change in angular momentum of disc in first 2 seconds in Nm second will be(1) 2.5(2) 5(3) 10(4) 20(e)In the above question, angular displacement of the disc, in first two second will be in radian:-(1) 2.5(2) 5(3) 10(4) 20Plz guys...I just don't wanna copy it in my hw...I wanna learn how the correct answer came out...so plz explain your solution with proper formula and sign and don't spam...plzWould be very thankful to you...!!!
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Define wave length . write its SI unit❌dont spam anyone ❌​

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Define wave length . write its SI unit❌dont spam anyone ❌