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Natalija [7]
2 years ago
6

A student is designing a device that can be used for communication. Which TWO waves on the electromagnetic spectrum should the s

tudent use?
gamma rays

X-rays

ultraviolet waves

microwaves

radio waves
Chemistry
2 answers:
34kurt2 years ago
7 0

X rays and radio waves

never [62]2 years ago
4 0

Answer:

Explanation:

the answer would be x rays and radio waves

srry if im wrong

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3 years ago
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How many moles are in 43.9 L of oxygen
Ede4ka [16]

Answer: 2 mol

Explanation:

- According to the ideal gas law, One mole of an ideal gas at STP (standard temperature and normal pressure) occupies 22.4 liters.

- Using cross multiplication,

                               1 mol of (O2)        →       22.4 L

                                       ?                   →        43.9 L

Therefore, the number of moles of oxygen in 43.9 L = (43.9 × 1)/ 22.4 = 1.96 mol≈ 2 mol..


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3 years ago
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