Answer:
d)infrared waves
Explanation:
A remote control uses light waves just beyond the visible spectrum of light—infrared light waves—to change channels on your TV. This region of the spectrum is divided into near-, mid-, and far-infrared.
Answer:
right one is more efficient
Explanation:
Given
The projectile is in air for a time of t=8 sec
To find
The time it takes to reach the highest point
Explanation
A projectile moves up to the highest point and then again moves down following a parabolic path.
So it will reach the highest point at a time half the time it requires to follow teh parabolic path.
The time taken to reach the highest point is 4 sec
Conclusion
The time taken is 4 sec.
Answer:
explained
Explanation:
1. the Big Bang & the universe begins to expand - about 13.8 billion years ago
2. elements such as carbon and oxygen first exist
- 8 billion years before.
3.nuclear fusion begins in the Sun
- Our sun is 4.603 billion years old
4. earliest life on Earth
- Earth formed in early September on the cosmic calendar. Life apparently arose on Earth within less than a billion years after that, which means it was still in September (because each month on the cosmic calendar represents about 1.2 billion years).
5.dinosaurs go extinct
- 65 million years ago
6. earliest humans- 40 million years ago
