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drek231 [11]
4 years ago
6

Which two electromagnetic waves are useful for diagnosiing illnesses

Physics
1 answer:
sergeinik [125]4 years ago
5 0

Answer:

X-rays and radio waves

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The sound level of one person talking at a certain distance from you is 80 dB. If she is joined by 2 more friends, and all of th
Pepsi [2]

Answer:

Explanation:

sound level scale is logarithmic which is given by the following formula

L = 10 log I / I₀ where I₀ = 10⁻¹² W / m² s

80 = 10 log I / 10⁻¹²

8 = log I / 10⁻¹²

I / 10⁻¹² = 10⁸

I = 10⁻⁴ W / m² .s

for three person the intensity becomes three times ie

3 x 10⁻⁴

L = 10 log 3 x 10⁻⁴ / 10⁻¹²

= 10 log 3 x 10⁸

= 10 ( 8 + log 3 )

= 10 ( 8 + .477 )

= 84.77 dB .

4 0
3 years ago
Electron groups could be considered which of the following?
PSYCHO15rus [73]

Electron groups could be considered as  Lone pair electrons and bonded pairs of electrons.

Answer: Option D & B

<u>Explanation:</u>

The two or more electrons can be bonded by single bond, double bond, covalent bond of electrons can simply be lone pair of electrons. Unshared pair of electrons are generally termed as lone pair of electrons in an atom which are generally present in the outermost shell of atoms. Hence electron groups can be determined by bonded pairs and lone pairs of electrons.

3 0
4 years ago
If you're not satisfied with your fitness evaluation score, there's really little you can do about it.
BARSIC [14]

Answer:

False

Explanation:

3 0
3 years ago
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Which of the following is true about light waves and sound waves? A. Sound waves can move at different speeds, but light waves a
vivado [14]

Answer:

C

Explanation:

Sound waves speed up noticeably when moving through a solid or liquid, because all it is is just particles colliding; and particles are way closer together with those states of matter.

The speed of light can change when moving through different substances, but this is dependent on complicated factors such as frequency, polarization, intensity, et. cetera

The important part is that it does change speed, so your answer is C.

Hope this helps!

3 0
4 years ago
Approximately how much of the Sun's energy is currently reflected by Earth's atmosphere? 30% 40% 60% 70%n here.
Digiron [165]
<span>Approximately 30% of the Sun's energy is currently reflected by Earth's atmosphere</span>
7 0
3 years ago
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