Answer:
from every point on the surface of the tree, and in every direction.
Explanation:
The luminosity of an object refers to the total amount of light radiated by the object per second and it is measured in watts (w). Also, the apparent brightness of an object is a measure of the rate at which radiated energy from that object reaches an observer. Thus, the apparent brightness of an object is measured in watts per square meter.
Reflection can be defined as a phenomenon which typically involves a change in the direction of a ray of light or waves as it falls on a smooth surface.
Simply stated, reflection occurs when a ray of light or wavefronts bounces off a smooth surface.
When an object like a tree is illuminated by the sun, and you are looking toward the tree, light rays leave the object from every point on the surface of the tree, and in every direction.
This ultimately implies that, the light rays would be scattered in different directions because the tree has a rough surface. This phenomenon is known as diffuse reflection.
Explanation:
Given that,
Diameter of the gold wire, d = 0.84 mm
Radius, r = 0.42 mm
Electric field in the wire, E = 0.49 V/m
(a) Electric current density is given by :
And electric field is :
is resistivity of Gold wire
So,
(b) The potential difference between two points in the wire is given by :
(c) Resistance of a wire is given by :
Hence, this is the required solution.
Answer:
Explanation:
Given that
Frequency =172Hz
Speed of sound =344m/s
Distance from A is 8m.
The wave length λ=v/f
Therefore, λ=344/172
λ=2m
for destructive interference, the path difference must be λ/2, the equation for destructive interference
Δr = (2n + 1) λ / 2
For the first interference n = 0
Δr = λ / 2
∆r=2/2
∆r=1m
the closest you can be to speaker B and be at a point of perfectly destructive interference is 1m
Answer:
Explanation:
the force that you applied caused the notebook to move.
the force applied on the notebook by the table causes it to stop moving.
this is because after sometime the book uses up the force and later the force you applied is less than that of the force by the table.
