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sergeinik [125]
3 years ago
14

the temperature of refrigeration units, salad bars and other cold items must be kept at ____ or colder: a. 41 f (5 c) b. 45 f (9

c) c. 50 f (10 c) d. 35 f (2 c)
Physics
1 answer:
Alenkinab [10]3 years ago
8 0
<span>The correct option is: (A) 41 °F (5°C)

Explanation:
As the temperature increases (from 6-7 °C), the tendency of a bacteria to grow also increases. Therefore, it is recommended to keep the temperature of refrigeration units, salad bars and other cold items at 41 °F (5 °C) or colder. Hence, the correct answer is option (A).</span>
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Give examples of the one element from the alkaline earth metal group and one from the noble gases group. Include each element at
zhuklara [117]
Alkali metals: left column of your periodic table (not hydrogen, but anything below it). They have one valence electron, which they are happy to share in a reaction.

Halogens: second column from the right of your periodic table. They are one electron short of a full shell, so they are reactive in the opposite way that alkalis are--they want electrons.

Atomic number (number of protons) is the big number on the periodic table square. Hydrogen's is 1.

Atomic mass is a little number down below. For example, Hydrogen's is 1.008.

Neutrons are a tricky subject, because different isotopes of the same element can have different numbers of neutrons. You can't generally get this from the atomic mass, because the atomic mass is a weighted average of naturally occurring isotopes. Hydrogen can have 0,1, or 2 neutrons. To answer this, you'd have to choose a particular isotope from the table of isotopes (a completely different chart from the periodic table) which has a certain number of neutrons: n = weight - Z.

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<span> Number of principal shells is the row of the periodic table. </span>
8 0
3 years ago
For a home sound system, two small speakers are located so that one is 52 cm closer to the listener than the other. What is the
galina1969 [7]

Answer:

The first frequency of audible sound in the speed sound is

f = 662 Hz

Explanation:

vs = 344 m/s

x =  52 cm * 1 / 100m = 0.52m

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d = 2x

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So the frequency in the speed velocity is

f = 1 / T

f = vs / x = 344 m/s / 0.52m

f ≅ 662 Hz

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I think it is D but don't count on it

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