Homework Statement
Jack decides to create his own temperature scale. He places an uncalibrated mercury thermometer into an ice-water bath and records the mercury level as 20.0S. He then places the same thermometer above boiling water and records the mercury level as 170S. Finally, he divides...
I found out that sound waves are longitudinal waves; radio waves are transverse waves.
My thinking is that as the boy speaks into the phone, sound waves are transmitted into the phone.
So my guess is that the phone is receiving longitudinal waves?
Dear Sir, thank you for the reply and clarification.
The actual question is as follows:
David switched on his television set and radio. As he was resting, he received a phone on his smartphone. He picked it up and began talking over the phone.
In the above situation, how many of the devices...
Homework Statement
A person speaks into a smartphone.
What type of wave does the smartphone receive?
2. The attempt at a solution
I thought the answer is longitudinal wave. Is that right?
Or does the smartphone receive radio waves?
Homework Statement
If we connect the neutral and Earth wires wrongly in the plug, can the appliance still work?
Homework Equations
The Attempt at a Solution
I am not too sure, but my answer is probably no. The circuit cannot be completed, as the current will flow to the ground...
I think the potassium manganate (VII) must be acidified, so that the hydrogen ions will mop up any excess oxygen atoms that were otherwise not taken up.
Thank you for the reply, Borek :smile:
I am not too sure actually.
My thoughts are based on the pH of dilute hydrochloric acid. It's 1.0, which is very low.
Could it be that the pH of concentrated hydrochloric acid is lower than 1.0?
In other words, maybe for a particular named acid...
Homework Statement
I understand that pH is a measure of the concentration of hydrogen ions in a solution.
A more concentrated acid would have more hydrogen ions in a given volume of solution? Wouldn't that mean that it should have a much lower pH?
Why then do we have the pH of dilute...
Homework Statement
Some gas is heated in a sealed container. How do the average distance between the gas molecules, and the frequency of the molecules' collision with the walls, change when the container
(A) has a fixed volume, and
(B) is allowed to expand outwards?
The attempt...
Sodium carbonate will not decompose in the presence of heat. This is because sodium is a very reactive metal, and hence forms very strong bond with the carbonate ion. In contrast, aluminium is not as reactive as sodium. Hence the bond by aluminium is weaker, and aluminium carbonate will...
Homework Statement
A solenoid with a large number of turns of wire is connected in series with an ammeter and a battery.
An iron rod is moved towards the solenoid at constant speed.
What will happen to the reading on the ammeter
(A) as the rod moves closer to the solenoid, before...
Thank you for the reply :)
Yes, you are right. Air is introduced into the empty space above the mercury, so that the empty space is no longer vacuum.
Your help is greatly appreciated!
Homework Statement
The mercury in a barometer of cross-sectional area 1cm square has a height of 75cm. There is vacuum above it, of length 9cm.
What is the volume of air, measured at atmospheric pressure, that would have to be admitted to cause the mercury column to drop to 59cm...