Answer:Energy is absorbed in exact amounts that correspond to differences in energy levels.
Explanation:
According to Bohr's theory, an electron moves from a lower to a higher energy level when it absorbed photon of a given energy. The energy of the photon absorbed must be equal to the energy difference between the higher and lower energy level. Thus energy is absorbed only in discreet amounts that correspond to differences in energy levels. Absorption of energy in discreet amounts is what is meant by the term 'quantization'.
We will apply:
Q = mcΔT; where Q is the heat, m is the mass, c is the specific heat capacity and ΔT is the temperature change.
30,000 = 390 x 3.9 x ΔT
ΔT = 19.7 °C
The temperature change is of 19.7 °C.
Explanation:
Mass : -
1. It is the amount of mass present in an object.
2. SI unit : Kilograms ( kg )
3. Relation between Mass and Weight is W = mg.
Weight : -
1. It is the force with which it is attracted towards the centre of the earth.
2. SI unit : Newton ( N )
3. Relation between Mass and Weight is W = mg.
The sound gets louder, like hitting a metal pole on a thin metal beam, the energy increases as the sound does.
Answer:
A(i)
The solution to this question is shown on the second uploaded image
A(ii)
The final speed is 
B
The block speed after a distance L is 
Explanation:
From the question
The net force i the x-direction is mathematically represented as
From the the diagram in the second uploaded image we see that
Therefore
Making a the subject
Applying the law of motion
where u = 0 m/s and s =L
=>
According to Energy conservation law and work theorem
Workdone by F + Workdone by gravity = change in kinetic energy
Mathematically this is given as
Since u = 0 m/s
