Explanation:
Measurement plays an important role in our daily lives because they are useful to do basic tasks, such as taking the temperature of a child with the help of a thermometer,making time estimations,measure out medicines and find out weights, areas and volumes of different substances
Answer:
392 Newtons
Explanation:
In order to find the weight, you have to multiply the mass by the gravitation constant (9.8), which gives us 40.0 * 9.8 = 392 Newtons.
What is the primary source of a sound?
C. A vibration
Which of the following best describes reverberation?
A. The wavefronts become mixed and broken up due to contact with a rough or irregular surface.
_______ occurs when a body’s molecular wavelength sends vibrations to another body, resulting in the production of another sound wave.
D. Resonance
Which of the following is an example of the Doppler effect?
B. Vibrations from a tuning fork pass through the air and cause a nearby dish of water to produce ripples of the same frequency.
In Sir Isaac Newton's time in the early 1700s, what was the general consensus among scientists on the properties of light?
D. Light is composed of particles and travels in a straight line.
If the angle of incidence of a light source to a shiny surface is 30 degrees, what will the angle of reflection be?
C. 30 degrees
If a material has a high index of refraction, it has a
B. high optical density, and light travels more slowly through it.
Which of the following statements regarding the visible spectrum of light is accurate?
D. It has the longest wavelength of all types of waves along the electromagnetic spectrum.
If you were to combine a beam of blue light and a beam of yellow light, what would the result be?
C. Green light
The type of light waves that living things give off naturally is called
D. visible light.
When you're standing in a pool in the summertime, and your leg looks shorter under the water than in air, this is an example of light
B. refraction.
Answer:
Niels Bohr
Explanation:
Niels Bohr was scientist whose model showed electrons location around a nucleus and all in an orbit.The orbit had varying energies according to their sizes.This model further indicated that when an electron is lost or gained, radiation is absorbed or emitted.The modern atomic model was prepared from quantum mechanics which shows how matter differ in atomic and subatomic levels.In this model, the chances of finding an electron is higher where the cloud is more dense.Bohrs model resembles the electron cloud model is that they both talk about position of electrons in an atom, and the energy associated with size of the orbit occupied by the electron.