Answer:
The best wavelengths of visible light for photosynthesis fall within the blue range (425–450 nm) and red range (600–700 nm). Therefore, the best light sources for photosynthesis should ideally emit light in the blue and red ranges.
Explanation:
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A. Log and replant ¼ of the forest every 15 years.
Explanation:
As Sam utilizes simulation technology to demonstrate the greenhouse tactics that can maintain the woodlands and deliver an endurable source of food and wood, as it has already been given that the simulation needs a regeneration rate of 60 years.
The tactics that would allow the fast regeneration and longevity of the forest preserves would stand to log and replant one-fourth of the forest every fifteen years. Hence providing the most sustainable wood resource.
Answer:
Energy is the ability to do work. Work refers to any change in the position, shape or size of an object as a result of its contact with another object - like dropping a rock on your foot. The amount of energy that is exchanged between two objects when they come into contact is called mechanical energy. This type of energy transfers all kinds and forces from one part of an object to another and can be transferred in many directions at once (for example, heat). Work and potential energy are related but not identical topics. Potential energy includes work done by gravity pulling things down and using elastic forces squeezing something together like a spring.
Explanation:
Answer:
Energy exists in many forms, but we can group them into three general categories: kinetic energy, potential energy and thermal energy. Work is the transfer of quantities of one form of energy to another (i.e., from a muscle to its surroundings), or vice versa. Kinetic and potential energies are classically called "energy" because they are not dependent on a particular point in space for their existence; indeed, all physical systems contain both kinetic and potential energies.
Na+ b/c Na+ influx results in positive membrane potential
Answer : The correct option is, (1) an atom with 20 protons, 21 neutrons, and 20 electrons.
Explanation :
Isotope : It is defined as the element that have the same number of protons but have the different number of neutrons of each of the atom.
Atomic number is defined as the number of protons or number of electrons.
Atomic number of = number of protons = number of electrons
Mass number is defined as the sum of number of protons and number of neutrons.
Number of neutrons = Mass number - Number of protons
As we are given,
Element = Calcium
Number of protons = 20
Number of electrons = 20
Number of neutrons = 20
For the isotope of calcium, the element should have the same number of protons but the different number of neutrons of each of the atom.
From this we conclude that, the option (1) would be an isotope of calcium because in this the protons and electrons are same but neutrons are different.
Hence, the correct option is, (1) an atom with 20 protons, 21 neutrons, and 20 electrons.