Answer:
The person's ear canal length is 2.91 cm.
Explanation:
Given that,
Frequency = 3000 Hz
Temperature = 30°C
We need to calculate the speed
Using equation of sound wave with temperature
[texs]v(t)=331+0.6\times T[/tex]
Put the value of T


We need to calculate the length
Using formula of closed organ pipe


Where, L = length
v = velocity
f = frequency
Put the value into the formula




Hence, The person's ear canal length is 2.91 cm.
Tennis ball will move with 1/3 th velocity of plastic ball
F_g=Gm_1m_2/r^2. mass and distance determines gravity.
Answer:

Explanation:
Given that
Angle ,θ = 30°
From Malus law,Intensity given as

Io=Intensity of unpolarized light
I=Intensity of emerging light
Now by putting the value of angle


We know that



Therefore ratio will be 