Case study (4 Marks)

Question 14 Marks

The radio and TV programmes, telecast at the studio, reach our antenna by wave motion. Is it a mechanical wave or nonmechanical?

Answer

It is a non-mechanical wave because this type of wave does not require a material medium to travel.

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Question 24 Marks

A 4.0kg block is suspended from the ceiling of an elevator through a, string having a linear mass density of $19.2 \times 10^{-3}kg/m$. Find the speed (with respect to the string) with which a wave pulse can proceed on the string if the elevator accelerates up at the rate of $2.0m/s^2$. Take $g = 10m/s^2$.

Answer

$\text{m}=19.2\times10^{-3}\text{kg/m}$
From the freebody diagram,$\text{T}-4\text{g}-4\text{a}=0$
$\Rightarrow\text{T}=4(\text{a}+\text{g})=48\text{N}$
Wave speed, $\text{v}=\sqrt{\Big(\frac{\text{T}}{\text{m}}\Big)}=50\text{m/s}$

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Physics Case study (4 Marks)

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