Differentiate between the following:
1. Point source of light & extended source of light
2. Single fixed pulley & single movable pulley
3. Luminous & Bio-luminous
4. Divergent & convergent beam of light
5. Efficiency of machine & mechanical advantage
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Answers
Answer:
Answer. Ans a) Point source is particularly localised emission or source of light at a point which decreases in proportiom to the inverse square of distance from the source while extended source are collection of such point sources of light together. Ans b)The umbra is the center part or the darkest part of the shadow.
A good example of a fixed pulley is a flag pole: When you pull down on the rope, the direction of force is redirected by the pulley, and you raise the flag. A movable pulley is a pulley that is free to move up and down, and is attached to a ceiling or other object by two lengths of the same rope.
Objects that can emit light energy by themselves are known as luminous objects. Objects that cannot emit light energy by themselves are known as non-luminous objects. These objects can cause a sensation of light. These objects do not cause the sensation of light.
Light rays from a point source of light travel in all directions, moving away with time. Such a beam of light is called a divergent beam of light. A convergent beam of light rays comes together (converges) after reflection and refraction at a single point known as the focus.
the ratio of the resistance force to the effort, called the actual mechanical advantage (AMA), is less than the IMA. The efficiency of any machine measures the degree to which friction and other factors reduce the actual work output of the machine from its theoretical maximum.
Explanation:
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Explanation:
Differentiate between the following: -
1. Point source of light & extended source of light?
ANSWER:-
Point source is particularly localised emission or source of light at a point which decreases in proportiom to the inverse square of distance from the source while extended source are collection of such point sources of light together.
2. Single fixed pulley & single movable pulley?
ANSWER→
Single fixed pulley Single movable pulley
SINGLE FIXED PULLEY
- 1. It is fixed to a rigid support.
- 2. Its mechanical advantage is one.
- 3. Its velocity ratio is one.
- 4. The weight of pulley itself does not affect its mechanical advantage.
- 5. It is used to change the direction of effort.
SINGLE MOVABLE PULLEY
- 1. It is not fixed to a rigid support.
- 2. Its mechanical advantage is two.
- 3. Its velocity ratio is two.
- 4. The weight of pulley itself reduces its mechanical advantage.
- 5. It is used as force multiplier.
3. Luminous & Bio-luminous
ANSWER→
- Bioluminescence is light produced by a chemical reaction within a living organism. Bioluminescence is a type of chemiluminescence, which is simply the term for a chemical reaction where light is produced. (Bioluminescence is chemiluminescence that takes place inside a living organism.)
- Bioluminescence is a "cold light." Cold light means less than 20% of the light generates thermal radiation, or heat.
- Most bioluminescent organisms are found in the ocean. These bioluminescent marine species include fish, bacteria, and jellies. Some bioluminescent organisms, including fireflies and fungi, are found on land. There are almost no bioluminescent organisms native to freshwater habitats.
Luminous Objects: Luminous Objects are objects which exhibit light in their own.
QUESTIONS:-
4. Divergent & convergent beam of light?
ANSWER→
- Light rays from a point source of light travel in all directions, moving away with time. Such a beam of light is called a divergent beam of light. A convergent beam of light rays comes together (converges) after reflection and refraction at a single point known as the focus.
QUESTIONS
5.Efficiency of machine & mechanical advantage?
Answer→
- Thus, the ratio of the resistance force to the effort, called the actual mechanical advantage (AMA), is less than the IMA. The efficiency of any machine measures the degree to which friction and other factors reduce the actual work output of the machine from its theoretical maximum
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