if an observer is hearing a rise in pitch that means the frequency of the waves in their position are falling

1 answer:

4 0

The statement above is FALSE.
Pitch refers to the highness or lowness of a sound. The pitch of a sound depends on the frequency of that pitch. The higher the frequency, the higher the pitch and the lower the frequency, the lower the pitch. Thus, if an observer is hearing a rise in pitch that means the frequency of the waves in that position are increasing.

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Answer:

Speed of both blocks after collision is 2 m/s

Explanation:

It is given that,

Mass of both blocks, m₁ = m₂ = 1 kg

Velocity of first block, u₁ = 3 m/s

Velocity of other block, u₂ = 1 m/s

Since, both blocks stick after collision. So, it is a case of inelastic collision. The momentum remains conserved while the kinetic energy energy gets reduced after the collision. Let v is the common velocity of both blocks. Using the conservation of momentum as :

$m_1u_1+m_2u_2=(m_1+m_2)v$

$v=\dfrac{m_1u_1+m_2u_2}{(m_1+m_2)}$

$v=\dfrac{1\ kg\times 3\ m/s+1\ kg\times 1\ m/s}{2\ kg}$

v = 2 m/s

Hence, their speed after collision is 2 m/s.

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