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Katena32 [7]
4 years ago
8

Letter A on this diagram is an example of

Physics
2 answers:
Free_Kalibri [48]4 years ago
7 0
The answer is a, <span>vaporization, liquid vaporizes to gas.. thats what a is showing</span>
MrRa [10]4 years ago
5 0
The answer is A vaporization 

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Which of the following terms describes a process for which Q=-73j?
Setler [38]
The correct option is D.
In the equation given above, Q stands for quantity of heat and J stands for Joule, which is the unit for measuring heat and the quantity of the heat given is negative. The negativity of the value of the heat given shows that the reaction is an exothermic reaction.
There are basically two types of reaction in term of heat involved, these are endothermic and exothermic reaction. An exothermic reaction is a type of reaction which gives out heat to the environment. Because of this, the energy value of the product is always lesser than that of the reactant. The difference between the energy of the products and the energy of the reactants is called enthalpy change of the reaction. For an exothermic reaction, the enthalpy change is always negative.
7 0
3 years ago
Read 2 more answers
1. How does the frequency of light affect the release of photons?
faltersainse [42]

Answer:

1. The frequency of the incident light must be equal to or greater than the threshold frequency of the photons before emission could take place.

2. The intensity of the incident light is proportional to the amount of photons released. The higher the intensity of light, the greater the amount of photons ejected.

Explanation:

1. Photoelectric effect is the process by which light with sufficient frequency falls on the surface of a material, e.g metal, to emit electrons. The incident light must have a minimum value of required frequency for the electrons to be ejected. This energy is termed work function which is a function of frequency.

So for emission to take place, the frequency of the incident light must be equal to or greater than the threshold frequency of the photons.

2. The intensity of light is a measure of the amount of light per unit area. When the intensity of incident light increases, the probability that photons would be released increases. The intensity of the incident light is proportional to the amount of photons released.

4 0
3 years ago
a block suspended from a spring. The spring is stretch 0.5 m. If the spring constant is 500 N/m, what is the weight of the block
ANEK [815]

Answer:250N

Explanation:

Spring constant=500N/m

Extension=0.5m

Weight=spring constant x extension

Weight=500 x 0.5

Weight=250

Weight is 250N

8 0
4 years ago
A double-paned window has two glass panes separated by a layer of air. Why
EleoNora [17]

Answer:

for insulation

5 0
3 years ago
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In a hydroelectric dam, water falls 30.0m and then spins a turbine to generate electricity.
ozzi

Answer:

(a) 294 J

(b) 229591.84 kg

Explanation:

height, h = 30 m

g = 9.8 m/s^2

(a) U = m x g x h

U = 1 x 9.8 x 30

U = 294 J

(b) Let the mass of water is m

U = m x g xh

80% of this energy per second is generating power

0.8 x m x 9.8 x 30 = 54 x 10^6

m = 229591.84 kg

Thus, the mass of water required is 229591.84 kg.

4 0
3 years ago
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