If the echo (the reflected sound) reaches your ear less than about
0.1 second after the original sound, your brain doesn't separate them,
and you're not aware of the echo even though it's there.
If the echo comes from, say, a wall, 0.1 second means you'd have to be
about 17 meters away from the wall. If you're closer than that, then the
echo reaches you in less than 0.1 second and you're not aware of it.
A. 30 meters . . .
No. You hear that echo easily
B. you're standing within range of both sounds . . .
No. You hear that echo easily, if you're at least 17 meters from the wall.
C. less than 0.1 second later . . .
That's it. The echo is there but your brain doesn't know it.
D. 21.5 meters
No. You hear that echo easily.
Answer:
Explanation:
= number of polarizers through which light pass through = 5
= Angle between each pair of adjacent polarizers
= Intensity of unpolarized light
= Intensity of transmitted beam after passing all polarizers
It is given that
we know that the intensity of light after passing through "n" polarizers is given as
inserting the values
Answer:
Digital logic is the basis of computing and many other electronic devices as well as control systems found in this continually advancing digital world.
(too short, sorry)
<span>We need to calculate the resistance of a clock which draws current I=0.5A and is connected to a circuit of V=120V. We can find the resistance of a circuit from Ohm's law: I=U/R where I is the current, U is the voltage and R is the resistance. So lets manipulate Ohm's law to find the resistance: R=U/I. Now we input our numbers: R=120V/0.5A and we get R=240 Ohm. So the resistance is R=240 Ohm.</span>
Answer:
1.59 Tesla per second
Explanation:
Given that
Radius of the conductor loop, r = 1 m,
Maximum induced emf to the loop, e = 5 V,
We take an assumption, we assume that the rate which the magnetic field is changing is dB / dt.
We then go ahead to apply Farady's law of electromagnetic induction
e = rate of change of magnetic flux
e = dФ /dt
e = A * dB / dt, on substituting we see that
A = πr²
A = π * 1²
A = π, plug in the value for A
5 = 3.14 * dB / dt
dB / dt = 5/3.142
dB / dt = 1.59 Tesla per second
