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Which of the following is are true about progressive waves (i)  No particle of the medium is completely at rest (ii) Energy is confined to a region (iii) There is a continuous change of phase from one particle to next (iv) The disturbance which produces wave is confined to the region where it is produced

Which of the following is are true about progressive waves (i)  No particle of the medium is completely at rest (ii) Energy is confined to a region (iii) There is a continuous change of phase from one particle to next (iv) The disturbance which produces wave is confined to the region where it is produced Correct Answer (i) & (iii)

CONCEPT: 

  • The wave which travels in the medium without change the amplitude in the same direction in the medium is known as a progressive wave.
  • Standing waves are those waves that oscillate in a medium with the same amplitude without moving out of the medium.
  • The table below shows the difference between the standing waves and progressive wave

Progressive waves

Stationary waves

Each particle in the medium executes SHM motion about them with the same amplitude

The particle at the node doesn’t execute SHM motion and all the other particles execute SHM.

The disturbance which produces the wave moves in the same direction without changing the velocity  

The disturbances which produce the waves are confined to a particular region

The phase of each particle changes continuously

The particles between the two successive nodes vibrate in the same phase, but there is a phase change for the next pair of particles

There is energy flow across every plane along the direction of propagation of the wave  

 

The energy flow is confined to a region

Since the waves are continuously moving no particle in the medium is at rest

Since waves are confined to a region the particles at the nodes will be at rest

EXPLANATION:

  • The wave which travels in the medium without change the amplitude in the same direction in the medium is known as a progressive wave.
  • The progressive wave can represent using the equation 

⇒ y = A Sin(kx - ω t+ ϕ )​

  • By inspecting the table it clear that only option (i) and (iii) are the correct or the options which matched with characteristics of a progressive wave.
  • Statement (ii) and (iv) are characteristics of the standing wave. Hence, option 3 is the answer

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being traded in China and Tibet. At that time, I was not a Buddhist; I wrote to the Dalai Lama asking him to say that this is harmful and he wrote back to say, “We
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council meeting, December 10-11, 2017. “We started an awareness campaign in the year 2005-2006 with H H The Dalai Lama when we learnt that tiger skins were
being traded in China and Tibet. At that time, I was not a Buddhist; I wrote to the Dalai Lama asking him to say that this is harmful and he wrote back to say, “We
will stop this.” He used very strong words during the Kalachakra in 2006, when he said, If he sees people wearing fur and skins, he doesnt feel like living. This sent
huge shock waves in the Himalayan community. Within six months, in Lhasa, people ripped the fur trim of their tubba, the traditional Tibetan dress. The messenger was ideal and the audience was receptive,” says Maas who is a conservationist. She has studied the battered foxs behavioral ecology in Serengeti,Africa. She heads the endangered species conservation at the Nature and Biodiversity Conservation Union (NABU) International Foundation for Nature, Berlin. “I metSamdhong Rinpoche, The Karmapa, HH the Dalai Lama and Geshe Lhakdor and I thought, if by being a Buddhist, you become like this, I am going for it, “says Maas, who led the IBC initiative for including the Buddhist perspective to the global discourse on climate change by presenting the statement, The Time to Act is Now: aBuddhist Declaration on Climate Change, at COP21 in Paris. “It was for the first time in the history of Buddhism that leaders of different sanghas came together to take a stand on anything! The statement lists a couple ofimportant things: the first is that we amass things that we dont need; there is overpopulation; we need to live with contentment and deal with each other and theenvironment with love and compassion,” elaborates Maas. She is an ardent advocate of a vegan diet because “consuming meat and milk globally contributes more toclimate change than all "transport in the world.” Turning vegetarian or vegan usually requires complete change of perspective before one gives up eating their favorite food. What are the Buddhist ways to bringabout this kind of change at the individual level? “To change our behavior, Buddhism is an ideal vehicle; it made me a more contented person,” says Maas, who grewup in Germany, as a sausage chomping, meat-loving individual. She says, “If I can change, so can anybody”. Why is Ms. Barbara an ardent follower of vegan diet?
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council meeting, December 10-11, 2017. “We started an awareness campaign in the year 2005-2006 with H H The Dalai Lama when we learnt that tiger skins were
being traded in China and Tibet. At that time, I was not a Buddhist; I wrote to the Dalai Lama asking him to say that this is harmful and he wrote back to say, “We
will stop this.” He used very strong words during the Kalachakra in 2006, when he said, If he sees people wearing fur and skins, he doesnt feel like living. This sent
huge shock waves in the Himalayan community. Within six months, in Lhasa, people ripped the fur trim of their tubba, the traditional Tibetan dress. The messenger was ideal and the audience was receptive,” says Maas who is a conservationist. She has studied the battered foxs behavioral ecology in Serengeti,Africa. She heads the endangered species conservation at the Nature and Biodiversity Conservation Union (NABU) International Foundation for Nature, Berlin. “I metSamdhong Rinpoche, The Karmapa, HH the Dalai Lama and Geshe Lhakdor and I thought, if by being a Buddhist, you become like this, I am going for it, “says Maas, who led the IBC initiative for including the Buddhist perspective to the global discourse on climate change by presenting the statement, The Time to Act is Now: aBuddhist Declaration on Climate Change, at COP21 in Paris. “It was for the first time in the history of Buddhism that leaders of different sanghas came together to take a stand on anything! The statement lists a couple ofimportant things: the first is that we amass things that we dont need; there is overpopulation; we need to live with contentment and deal with each other and theenvironment with love and compassion,” elaborates Maas. She is an ardent advocate of a vegan diet because “consuming meat and milk globally contributes more toclimate change than all "transport in the world.” Turning vegetarian or vegan usually requires complete change of perspective before one gives up eating their favorite food. What are the Buddhist ways to bringabout this kind of change at the individual level? “To change our behavior, Buddhism is an ideal vehicle; it made me a more contented person,” says Maas, who grewup in Germany, as a sausage chomping, meat-loving individual. She says, “If I can change, so can anybody”. According to the passage, what do you infer from ''The messenger was ideal and the audience was receptive''?
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