Explanation:
Convection is primarily a mode of heat transfer which involves the movement of the particles of the medium. It is most notable in fluids i.e liquids and gases.
Gases makes up the atmosphere. Liquids makes up the ocean. Therefore, convection is possible in them.
The process of convection in the atmosphere and ocean is primarily due to density differences.
- In the ocean, heat from the sun warms the surface water and it is lighter. The water below is dense. As the surface water loses its heat, it becomes dense and therefore sinks. The sinking water is replaced by the cold water from below. This sets up the ocean currents powered by convection.
- In the atmosphere, air close to the ground is very warm. Warm air is light and it will rise. The air high up is cold and it will sink. The cold air will replace the warm air and vice versa. This is the convection in the atmosphere.
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Answer:
7.05 × 10⁻²² nm
Explanation:
Step 1: Given and required data
- Energy evolved when a mole of electrons changes between the 2 levels (E): 282 kJ
- Planck's constant (h): 6.63 × 10⁻³⁴ J.s
- Speed of light (c): 3.00 × 10⁸ m/s
Step 2: Calculate the wavelength (λ) of the light evolved
We will use Planck-Einstein's relation.
E = h × c/λ
λ = h × c/E
λ = (6.63 × 10⁻³⁴ J.s) × (3.00 × 10⁸ m/s)/(282 × 10³ J) = 7.05 × 10⁻³¹ m
We will convert λ to nm using the conversion factor 1 m = 10⁹ nm.
7.05 × 10⁻³¹ m × 10⁹ nm/1 m = 7.05 × 10⁻²² nm
The mass in kilograms of E85 with density of 0.758 g/mL that can be contained in a 13.0 gallon tank is 2,869.34g.
<h3>How to calculate mass?</h3>
The mass of a substance can be calculated using the following formula:
Density = mass ÷ volume
According to this question, a substance E85 has a density of 0.758g/mlL and it contains 13.0gallon of liquid. The mass can be calculated as follows:
13 gallon can be converted to 3785.412 millilitres
mass = 0.758 × 3785.412
mass = 2,869.34g
Therefore, the mass in kilograms of E85 with density of 0.758 g/mL that can be contained in a 13.0 gallon tank is 2,869.34g.
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Answer: 80 ml
Explanation:
V= vol ml, C = concentration %
V1 = 20ml, C1 = 20%
V2 = ? , C2 = 5%
V1C1 = V2C2
V2 = (V1C1)/C2
V2 = (20ml x 20%) / 5% = 80 ml
Explanation:
Alpha particles are less penetrating than a beta or gamma particle. Alpha particles are doubly charged helium nuclei. It consists of two neutrons and two protons.
The penetration of any ray is given by the following relation :
T = e^-u * L
Where
T is the transmittance of any material
u is the coefficient of penetration
L is the length of penetration
The mass and charge of alpha particle is more as compared to beta and gamma particles. They can produce ions easily. So, they penetrate more when compared to beta and gamma rays.