• 1) The pressure of a sample of gas in a 2.00-L container is 876 mmHg.
What will the pressure be if the sample is placed in a 400 mL
container? P1V1=P2V2

4380 mmHg

Explanation:

Boyle's Law can be used to explain the relationship between pressure and volume of an ideal gas. The pressure is inversely related to volume, so if volume decrease the pressure will increase. It can be expressed in the equation as:

P1V1=P2V2

In this question, the first condition is 2L volume and 876 mmHg pressure. Then the system changed into the second condition where the volume is 400ml and the pressure is unknown. The pressure will be:

P1V1= P2V2

876 mmHg * 2L = P2 * 400ml /(1000ml/L)

P2= 876 mmHg * 2L / 0.4L

P2= 4380 mmHg

Alpha, beta and gamma particles

Explanation:

An Aluminium shield will protect against any form of radiation emitted by the radioactive body.

Aluminium is a dense and highly effective radioactive shield.

It has a fairly high density and it is a metal.

Gamma rays being the most penetrative and energetic of all the radiations can be stopped by a thick shield of aluminium.

Therefore we expect that other less energetic radiations will effective be cut off.