Physics
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a year agoBeginner-Level 5
Significance of de Broglie's Hypothesis in Modern Physics (NCERT-based answer):
De Broglie's hypothesis is a revolutionary idea which changed the understanding of matter and wave as we know it. This hypothesis introduced the concept that particles of matter, like electrons, and Proton, can behave like wave and have wave-like properties, just as light exhibits both wave and particle nature.
According to de Broglie, any moving particle has a wavelength given by:
where is the wavelength, is Planck's constant, is the mass, and is the velocity of the particle.
New answer posted
a year agoBeginner-Level 5
The photoelectric effect when light is projected in a metal surface, it's surface ejects electron (which are in outermost shell or free electron). This happens because the light provides additional energy to the electron to detach itself from metal surface. Well to do this light must have a certain amount of energy which in other words can be said the right frequency of light is required for photoelectric effect.
This frequency must be above a certain minimum value (called threshold frequency) fixed for every metal, regardless of its intensity. Photoelectric effect cannot be explained by the wave theory of light.
New answer posted
a year agoContributor-Level 10
1.14 One of the reasons of not so much popularity amongst masses about Physics is it is full of equations and symbols. I tend to agree with Scientist Dirac. But when one look at the simple equations, they are really beautiful. For example – W = mg, F = pA, E = mc2 etc.
New answer posted
a year agoContributor-Level 10
1.13 Both men and women are of equal caliber. Since nature has given extra strength to women to bear child, they can endure immense physical and mental pain than men. Women have a keen eye for perfection, hence more and more women are being employed in present industries. Earlier the professions like fighter pilots, CEO, security personnel, cab drivers, assemblers, in factories, even football referee were believed to be male dominated, but we can see the presence of women in these fields also.
Following is the list of some of the women, who have excelled in various fields.
- Indira Gandhi
- Margaret Thatcher
- Mother Teresa
- Indra Nouie
- Kalpana Cha
New answer posted
a year agoContributor-Level 10
1.12 Mass awareness is the only tool. By using different communication platforms like Radio, TV, Social media, Movies etc. people can be made aware. The superstitious belief can be explained in a scientific way and they can be made aware.
New answer posted
a year agoContributor-Level 10
1.12 Mass awareness is the only tool. By using different communication platforms like Radio, TV, Social media, Movies etc. people can be made aware. The superstitious belief can be explained in a scientific way and they can be made aware. |
New answer posted
a year agoContributor-Level 10
1.11
(a) Good. Mass vaccination has helped the entire world to completely eradicate small pox.
(b) Good. Television helps in imparting education and has helped to a great extent to spread literacy, especially in rural belt. Along with education, it also helps to keep people informed about various news and important information through various TV programs.
(c) Bad. Because it leads to female foetus killing through abortion and changes the sex ratio in human population
(d) Good. It helps to avoid repetitive work and takes care of human error.
(e) Good. For data collection, communication, surveillance etc.
(
New answer posted
a year agoContributor-Level 10
1.10 The living example is Wuhan virus. A scientist works for the benefit of mankind but when the formula falls in wrong hand, it brings a disaster. The whole world is still reeling under its harmful effect. Another example is AK-47. The designer never imagined that it could be used in this fashion, as being used by the terrorists.
New answer posted
a year agoContributor-Level 10
1.9 A self-driven car arrives at a mall, passenger disembarks and the car automatically goes to the parking lot. A GPS based system guides the car to a vacant parking space.
The owner enters the mall. A robot comes to the GATE and greets. By scanning the face, the robot collects the data from the central database, finds out his/her nationality, food choices, medical history and shopping preferences.
On the monitor fitted on the robot, he / she orders the food, groceries etc. Robot speaks in his / her mother tongue and guides to the apparel shop etc. After that another robot waits near the exit GATE with the shopping trolley. The payment
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