What are two different types of electron microscopes? There are two main types of electron microscope – the transmission EM (TEM) and the scanning EM (SEM). The transmission electron microscope is used to view thin specimens (tissue sections, molecules, etc) through which electrons can pass generating a projection image. What is the greatest advantage of […]
How many significant figures does 0.00120 have?
How many significant figures does 0.00120 have? 3 significant figures How many significant figures does 0.003 have? # of sig. fig. # of decimal places c) 0.003 1 3 d) 0.00170 3 5 e) 3,000 assume 1 0 f) 3,000. 4 0 How many significant figures does 0.020 have? two significant figures How many significant […]
Is parsec is a unit of Time?
Is parsec is a unit of Time? Unfortunately, like the similarly misused ‘light-year’, the parsec is a unit of length, not of time. A parsec is equal to about 3.26 light-years or roughly 31 trillion kilometres (19 trillion miles). The unit has its origins in one of the first methods of determining the distance to […]
Why do plants look green in color 10?
Why do plants look green in color 10? Answer: The leaves of plants contain green pigments called chlorophyll which is necessary for photosynthesis. Plants reflect green light of sunlight, so they look green. Why are some plants not green in Colour? When leaves contain high concentration of anthocyanin pigments, the leaves appear red or purple […]
What is the light spectrum called?
What is the light spectrum called? The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. What is the meaning of 2020 vision? 20/20 vision is a term used to express normal visual acuity […]
What is the significance of reference point for measuring distance?
What is the significance of reference point for measuring distance? A reference point is a place or object used for comparison to determine if something is in motion. An object is in motion if it changes position relative to a reference point. Objects that are fixed relative to Earth – such as a building, a […]
Is Lemon juice is a good conductor of electricity?
Is Lemon juice is a good conductor of electricity? When lemon juice is added to water, the acid dissociates into anions and cations which are charged. Hence they can conduct electricity as these charged particles are able to flow inside the acid. Hence when the salt or lemon juice is mixed in distilled water it […]
What is the angle of incident ray?
What is the angle of incident ray? In geometric optics, the angle of incidence is the angle between a ray incident on a surface and the line perpendicular to the surface at the point of incidence, called the normal. The angle of incidence at which light is first totally internally reflected is known as the […]
Is La Nina related to climate change?
Is La Nina related to climate change? In a warming climate, rainfall extremes are projected to shift eastward along the equator in the Pacific Ocean during El Niño events and westward during extreme La Niña events. Will 2020 be the hottest year on record? Globally, 2020 was the hottest year on record, effectively tying 2016, […]
Is Earth a perfect sphere?
Is Earth a perfect sphere? Even though our planet is a sphere, it is not a perfect sphere. Because of the force caused when Earth rotates, the North and South Poles are slightly flat. Earth’s rotation, wobbly motion and other forces are making the planet change shape very slowly, but it is still round. Why […]