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3 years ago

There are two different isotopes; X and Y, both contain the same number of radioactive substances. If sample X

Physics

1 answer:

antiseptic1488 [7]3 years ago

6 0

Answer:

Half life refers to the time for 1/2 of the radioactive atoms to decay.

Suppose that X has a half life of 10 days and Y has a half life of 20 days

If both start out with 1000 radioactive atoms then after 20 days

X would have 250 radioactive atoms and Y would have 500 atoms

The rate of decay is greater for the shorter half life:

In the example given X must have the smaller rate of decay because it has a longer half life.

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Choir members are traditionally grouped into four main vocal registers: bass,

Bond [772]

Answer:

The bass has the lowest frequency ,it only causes vibrations but at a lower frequency

7 0

3 years ago

Which of the following is a risk associated with the application of biotechnology?

dmitriy555 [2]

Answer:

d.) potential for the exchange of genetic material

Explanation:

3 0

3 years ago

How far would a horse that rides at 8.1 m/s travel and 8.5 minutes

Xelga [282]

V = S/t

The time is in minutes, it needs to be converted to seconds, because the Velocity 8.1meters/second.

1 min -------- 60 secs
8.5 min -------- x secs
-> x = 8.5 . 60
-> x = 510secs

-> 8.1 = S/510
-> 510 x 8.1 = S
-> S = 4131 meters

3 0

4 years ago

A rubber ball and a lump of clay have equal mass. They are thrown with equal speed against a wall. The ball bounces back with ne

gregori [183]

Answer:

The ball experiences the greater momentum change

Explanation:

The momentum change of each object is given by:

$\Delta p = m \Delta v= m (v-u)$

where

m is the mass of the object

v is the final velocity

u is the initial velocity

Both objects have same mass m and same initial velocity u. So we have:

- For the ball, the final velocity is

$v=-u$

Since it bounces back (so, opposite direction --> negative sign) with same speed (so, the magnitude of the final velocity is still u). So the change in momentum is

$\Delta p=m(v-u)=m((-u)-u)=-2mu$

- For the clay, the final velocity is

$v=0$

since it sticks to the wall. So, the change in momentum is

$\Delta p = m(v-u)=m(0-u)=-mu$

So we see that the greater momentum change (in magnitude) is experienced by the ball.

3 0

3 years ago

Can somebody please help with these

Sever21 [200]

Answer:

Fusion

Fission

Explanation:

The first problem describes a nuclear fusion process. In this process;

small atomic nuclei combines to form a larger one.
it is accompanied by a large release of energy
this energy provides the needed temperature to set up another light nuclei to fuse.

The second problem describes nuclear fission,

a heavy nuclide is bombarded with a neutron.
the product formed becomes unstable and subsequently breaks down.
This leads to a series of chain reactions until stability is attained.

6 0

3 years ago