Suppose that a sound has initial intensity β1 measured in decibels. This sound now increases in intensity by a factor f. What is
1 answer:
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Answer:
Explanation:
Given:
Initial mass of isotope (m₀) = 20 g
Half life of the isotope = (ln 4) years
The general form for the radioactive decay of a radioactive isotope is given as:
Where,
So, the equation is:
At half-life, the mass is reduced to half of the initial value.
So, at . Plug in these values and solve for 'k'. This gives,
Hence, the equation for the mass remaining is given as:
Answer:
Torque,
Explanation:
Given that,
The loop is positioned at an angle of 30 degrees.
Current in the loop, I = 0.5 A
The magnitude of the magnetic field is 0.300 T, B = 0.3 T
We need to find the net torque about the vertical axis of the current loop due to the interaction of the current with the magnetic field. We know that the torque is given by :
Let us assume that,
is the angle between normal and the magnetic field,
Torque is given by :
So, the net torque about the vertical axis is . Hence, this is the required solution.