His displacement is 0 .hope this helps :)
Answer:
- Fundamental quantities are quantity whose definition does not depend on other quantities.
There are seven fundamental quantities in physics:
Length (measured in metres)
Mass (in kilograms)
Time (in seconds)
Electric current (in Ampere)
Temperature (in Kelvin)
Amount of substance (in moles)
Luminous intensity (in candela)
- On the other hand, derived quantities are quantities that are defined using the fundamental quantities.
For example, derived quantities are:
Velocity, which is the ratio between length and time
Acceleration, which is the ratio between velocity and time
Energy, which is a product of mass and velocity squared
And many others.
B. Newton's First Law, I'm pretty sure. The first states that an object in motion stays in motion, and an object at rest stays at rest until an outside force is applied, and that seems pretty relevant.
Answer:
when a photon is created by an electron in a higher energy level. The electron looses energy and move to a lower energy level.
Explanation:
energy levels refer to various levels of energy possessed by the electrons in an atom. An electron in a higher energy level possesses more energy and more speed that that in a lower energy level. Electrons can move from one energy level to another when they gain energy from the surroundings or loose energy to the surroundings. They leave their energy level to fit into a new level where the energy level is same with the energy they now possess. Electrons hit by a photon tend to move to higher energy levels. But if an electron creates a photon it drops to a lower energy level
Answer:
v ’= 21.44 m / s
Explanation:
This is a doppler effect exercise that changes the frequency of the sound due to the relative movement of the source and the observer, the expression that describes the phenomenon for body approaching s
f ’= f (v + v₀) / (v-)
where it goes is the speed of sound 343 m / s, v_{s} the speed of the source v or the speed of the observer
in this exercise both the source and the observer are moving, we will assume that both have the same speed,
v₀ = v_{s} = v ’
we substitute
f ’= f (v + v’) / (v - v ’)
f ’/ f (v-v’) = v + v ’
v (f ’/ f -1) = v’ (1 + f ’/ f)
v ’= (f’ / f-1) / (1 + f ’/ f) v
v ’= (f’-f) / (f + f’) v
let's calculate
v ’= (3400 -3000) / (3000 +3400) 343
v ’= 400/6400 343
v ’= 21.44 m / s