Share & grow the world's knowledge!
We want to connect the people who have knowledge to the people who need it, to bring together people with different perspectives so they can understand each other better, and to empower everyone to share their knowledge.
Define the terms absorptive power, emissive power and emissivity.
Absorptive Power (A): It is that fraction of the total incident radiation that a body absorbs. It is defined as the ratio of the energy absorbed by the body to the total energy incident on it. A = (Energy absorbed) / (Total incident energy) Emissive Power (E): It is that amount of energy radiateRead more
Absorptive Power (A):
It is that fraction of the total incident radiation that a body absorbs. It is defined as the ratio of the energy absorbed by the body to the total energy incident on it.
A = (Energy absorbed) / (Total incident energy)
Emissive Power (E):
It is that amount of energy radiated per unit area by a body per unit time at some temperature. Its value depends upon the nature of the material as well as upon its temperature.
E = Energy emitted/area × Time
Emissivity (e):
It is the ratio of the emissive power of a body to the emissive power of a perfect black body at the same temperature. It varies between 0 and 1, with 1 being a perfect black body.
e = (E_body) / (E_black body)
Click for more:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/physics/chapter-10/
What are the guidelines for practicing Dhyāna effectively?
Practicing Dhyāna effectively requires a quiet, clean place. Sit in a comfortable posture like Padmāsana with an erect spine. Focus attention on a chosen object, such as the breath or a mantra. Stay calm and non-reactive to thoughts or distractions, gently redirecting attention if the mind wanders.Read more
Practicing Dhyāna effectively requires a quiet, clean place. Sit in a comfortable posture like Padmāsana with an erect spine. Focus attention on a chosen object, such as the breath or a mantra. Stay calm and non-reactive to thoughts or distractions, gently redirecting attention if the mind wanders. Begin with a few minutes daily, gradually increasing duration. Consistent practice develops concentration, fostering inner tranquility and mindfulness.
See lessWhat does Dhyāna mean and how does it transform from Dhārana?
Dhyāna, meaning meditation, is a state of deep contemplation or reflection. It transforms from Dhārana when concentration shifts from effortful focus to an uninterrupted flow of attention. This seamless transition occurs as the mind becomes immersed in the object of meditation. Dhyāna represents anRead more
Dhyāna, meaning meditation, is a state of deep contemplation or reflection. It transforms from Dhārana when concentration shifts from effortful focus to an uninterrupted flow of attention. This seamless transition occurs as the mind becomes immersed in the object of meditation. Dhyāna represents an elevated state of awareness where distractions disappear, and one experiences inner stillness and spiritual connection, laying the groundwork for the ultimate state of Samādhi.
See lessExplain the steps of the simple palming procedure described in the chapter.
The simple palming procedure begins with rubbing the palms together to create warmth. Then, the warm palms are gently placed over closed eyes without applying pressure. After holding for 10–15 seconds, the palms are lifted. This technique relaxes the eyes, reduces strain, and brings calmness to theRead more
The simple palming procedure begins with rubbing the palms together to create warmth. Then, the warm palms are gently placed over closed eyes without applying pressure. After holding for 10–15 seconds, the palms are lifted. This technique relaxes the eyes, reduces strain, and brings calmness to the mind. Regular practice helps soothe tired eyes and cultivates mindfulness, making it a helpful preparatory step for meditation.
See lessWhat is Jatru Trataka and how is it practiced?
Jatru Trataka is a Yogic technique of gazing to improve concentration. Practitioners fix their gaze on a specific object, such as a candle flame, without blinking, which sharpens mental focus and steadies the mind. This practice also reduces distractions, calms the nervous system, and improves eyesiRead more
Jatru Trataka is a Yogic technique of gazing to improve concentration. Practitioners fix their gaze on a specific object, such as a candle flame, without blinking, which sharpens mental focus and steadies the mind. This practice also reduces distractions, calms the nervous system, and improves eyesight. By fostering one-pointed attention, Jatru Trataka lays the foundation for deeper meditation practices like Dhārana and Dhyāna.
See less