Go through the following passage and answer the following questions:
During a school camping trip in the mountains, a group of students gathered around a bonfire on a cold winter evening. They sat at different distances from the fire. The students noticed that they could feel warmth even without touching the fire. Some students sitting closer to the fire felt warmer than those sitting farther away.
After some time, the teacher asked the students to observe a metal cooking vessel placed near the fire. The vessel became hot. Later, when it was removed from the fire and placed on a table, it gradually became cooler. The teacher explained that heat from the fire and the hot vessel was reaching the surroundings through a process called radiation.
The teacher further explained that radiation is the transfer of heat that does not require any medium. The heat from the Sun also reaches the Earth through the same process. Unlike conduction and convection, radiation can occur even through empty space.
1. Which property of radiation is demonstrated by the students feeling warm near the fire? -
2. The metal vessel became hot when kept near the fire. Which statement is correct? -
3. Which observation from the case study proves that all hot objects radiate heat? -
4. Which conclusion is best supported by the observations in the case study? -