All categories

4 years ago

Assessment started: undefined.

Physics

1 answer:

enot [183]4 years ago

5 0

Answer:

Option B: Group

Explanation:

The elements fluorine, chlorine, and iodine are commonly known as halogens.

They all have 7 valence electrons in their outermost shell and thus they all belong to group 7A in the periodic table.

Correct Answer is: Group

You might be interested in

PLEASE HELP ME WITH THIS ONE QUESTION

shtirl [24]

Answer:

$\lambda=1.39\times 10^{-4}\ s^{-1}$

Explanation:

Given that,

The half-life of Barium-139 is $4.96\times 10^3$

A sample contains $3.21\times 10^{17}$ nuclei.

We need to find the decay constant for this decay. The formula for half life is given by :

$T_{1/2}=\dfrac{0.693}{\lambda}\\\\\lambda=\dfrac{0.693}{T_{1/2}}$

Put all the values,

$\lambda=\dfrac{0.693}{4.96\times 10^3}\\\\=1.39\times 10^{-4}\ s^{-1}$

So, the decay constant is $1.39\times 10^{-4}\ s^{-1}$ .

4 0

3 years ago

When a radio is playing in the room next door, which sound waves can be heard best?

sattari [20]

Answer:

low sound waves like bass pass through walls better

Explanation:

6 0

4 years ago

People in the United States know that water boils at 212F. In Europe, people know that water boils at 100 C. Is the water in the

Zolol [24]

The units of temperature are different. one is Fahrenheit and the other is Celsius

8 0

4 years ago

Read 2 more answers

Parts of A Wave. Use the word bank below to identify the parts of a wave in this diagram. Type the word next to the letters belo

Gnom [1K]

Explanation:

A = Wavelength

The distance between two consecutive crest or trough is wavelength

B = Amplitude

The maximum distance covered by the particles of a wave

C = Rest postion/equilibrium

When there is no disturbance in the medium

D = Trough

It is the displacement in negative direction

E = Crest

It is the displacement in positive direction

(A) The relationship between the wavelength and frequency is given by :

$f=\dfrac{v}{\lambda}$

There is an inverse relationship between wavelength and frequency.

(B) $\lambda=\dfrac{v}{f}$

When the frequency is decreased, the wavelength of a wave increases.

4 0

4 years ago

Please answer like this :<br> 1 :<br> 2 :<br> 3 :<br> 4 :

coldgirl [10]

1: a system is a collection of two or more things/objects. but if you want to use a tennis ball for an example it would be considered an object but at an atomic level we could say it is a system. why? because, it is made up of millions of atoms and each and every atom could be considered an object
2: phone systems, ecological systems, space systems
3: the internal energy of the system can be understood by examining the simplest possible system. example: an ideal gas
4: electricity- by an electrical current.

5 0

3 years ago