The instrument is called a seismograph.
One of the characteristics of light is that it behaves like a wave. As a result, light can be defined by its wavelength and frequency. The frequency is how fast the wave vibrates or goes up and down. The wavelength is the distance between two peaks of the wave. Frequency and wavelength are inversely related, meaning that a low frequency wave has a long wavelength and vice versa.
When light hits a surface, some of it is absorbed and some of it is reflected. The light that is reflected is the colour of the object in that light. For example, a blue object absorbs all the colours of the spectrum except blue: it reflects blue light. Visible light waves are the only electromagnetic waves we can see. We see these waves as the colors of the rainbow. Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength. When all the waves are seen together, they make white light. When white light shines through a prism or through water vapor like this rainbow, the white light is broken apart into the colors of the visible light spectrum.
Cones in our eyes are receivers for these tiny visible light waves. The Sun is a natural source for visible light waves and our eyes see the reflection of this sunlight off the objects around us.
The color of an object that we see is the color of light reflected. All other colors are absorbed.
Light bulbs are another source of visible light waves.
Hope this helps :)
Answer:
![A=186.70\ \text{unit}^2](https://tex.z-dn.net/?f=A%3D186.70%5C%20%5Ctext%7Bunit%7D%5E2)
Explanation:
Given that,
![\angle QRS = 74^{\circ}\\\\QR = 17\ \text{units}](https://tex.z-dn.net/?f=%5Cangle%20QRS%20%3D%2074%5E%7B%5Ccirc%7D%5C%5C%5C%5CQR%20%3D%2017%5C%20%5Ctext%7Bunits%7D)
We need to find the area of sector QRS. The formula for the area of a sector is given by :
![A=\dfrac{\theta}{360}\times \pi r^2](https://tex.z-dn.net/?f=A%3D%5Cdfrac%7B%5Ctheta%7D%7B360%7D%5Ctimes%20%5Cpi%20r%5E2)
QR = RS = r = 17 units
So,
![A=\dfrac{74}{360}\times \dfrac{22}{7}\times (17)^2\\\\=186.70\ \text{unit}^2](https://tex.z-dn.net/?f=A%3D%5Cdfrac%7B74%7D%7B360%7D%5Ctimes%20%5Cdfrac%7B22%7D%7B7%7D%5Ctimes%20%2817%29%5E2%5C%5C%5C%5C%3D186.70%5C%20%5Ctext%7Bunit%7D%5E2)
So, the area of sector QRS is ![186.70\ \text{unit}^2](https://tex.z-dn.net/?f=186.70%5C%20%5Ctext%7Bunit%7D%5E2)
It’s the bridge between the Late Middle Ages, the Early Renaissance, and the Early modern period.
Answer:
Options (A), (D) and (E)
Explanation:
Mass wasting refers to the downward motion of sediments and rock particles along the slope of the area under the influence of gravity.
There are different types of mass wasting processes such as mudflow, slump, rockfall, debris flow and many more. This classification of mass wasting types are based on the 3 criteria namely-
- the type of motion of the materials
- the type of materials present in the flow
- the rate of movement of these sediments and materials.
For example, in the case of rockfall, the materials present in it are large fragments of rocks, the motion is vertical or nearly vertical and the particles fall at a rate of 10s of m/sec.
Thus, the correct answers are options (A), (D) and (E).