Answer:
I would say: D.
Explanation:
["Frequency is the number of times an object vibrates in 1 second; frequency is also measured in hertz and is recognized by your ears as differences in pitch."] Frequency is how many times an object vibrates in ONE second. So that knocks the answer down to either A or B. Frequency itself is also measured in hertz, which knocks the answer to: D. hertz per second.
Answer:
181 picometers is the radius of a gallium atom.
Explanation:
Primitive cubic cell is an arrangement in which constituent particles are present only at the corners of the cube.Also known as simple unit cell. In this arrangement number of total particles is equal to 1.
Gallium crystallizes in a primitive cubic unit cell.
Edge length of cubic unit cell = a = 362 pm
Let the radius be gallium atom be r
Two atoms of gallium touching each other = a =2r
362 pm = 2r
r = 181 pm
181 picometers is the radius of a gallium atom.
Answer:
D
Explanation:
The amount of energy released or absorbed is equal the product of the mass, the specific heat capacity and the temperature change. The temperature change being the difference between the final and initial temperature.
Q = mc∆T
Q = heat energy (Joules, J) m = mass of a substance (kg) c = specific heat (units J/g∙K)
∆ is a symbol meaning "the change in" ∆T = change in temperature (Kelvins, K)
From the data provided in the question, we can deduce that:
Q = 16.7KJ = 16,700J
m = 225g
c = 1.74J/g.k
For the temperature, let the final temperature be f. This means our ∆T = f - 20
16,700 = 225 * 1.74 * (f - 20)
16700 = 391.5 (f - 20)
f - 20 = 16700/391.5
f - 20 = 42.7
f = 20 + 42.7 = 62.7
The flowers bloom before the leaves grow because the sun is able to get to the forest floor. When the leaves grow, they take up all the sunlight and cast darkness on the forest floor, so the wildflowers can’t bloom anymore. Without sunlight, they can’t photosynthesize and create sugar/food for themselves.
Answer:
It would be choice A and D
Explanation:
Heat from the water will conduct into the metal. Hope this helps!