Density= mass/ volume
9000kg/m3= 1kg/ volume
Volume=1/9000 m3
Volume of atom is given as 4/3pr3
Hence 1/9000m3=4/3pr3
R=582.4878(for10^25 atoms)
For one atom =582.4878/10^25
= 5.824878×10^-23
Hence diameter= 1.165×10^-22
Assumptions here is that the atoms are spherical
Alphonce100 answered the question on June 15, 2018 at 03:43
- List the applications/uses of magnets.
(Solved)
List the applications/uses of magnets.
Date posted: April 18, 2018. Answers (1)
- What is the difference between hard and soft magnets?(Solved)
What is the difference between hard and soft magnets?
Date posted: April 18, 2018. Answers (1)
- Explain the methods of de-magnetizing a magnetic material.
(Solved)
Explain the methods of de-magnetizing a magnetic material.
Date posted: April 18, 2018. Answers (1)
- Describe the methods of magnetizing a magnetic material.(Solved)
Describe the methods of magnetizing a magnetic material.
Date posted: April 18, 2018. Answers (1)
- List the characteristics of magnetic field patterns.
(Solved)
List the characteristics of magnetic field patterns.
Date posted: April 18, 2018. Answers (1)
- List the properties of magnets(Solved)
List the properties of magnets
Date posted: April 16, 2018. Answers (1)
- State the applications of radioactivity(Solved)
State the applications of radioactivity
Date posted: April 12, 2018. Answers (1)
- A radioactive substance has a half life of 10 hours. Calculate the percentage of the sample that remains after 25 hours.(Solved)
A radioactive substance has a half life of 10 hours. Calculate the percentage of the sample that remains after 25 hours.
Date posted: April 12, 2018. Answers (1)
- A radioactive substance is found to have an activity of 360 counts per second. 5minutes later, it was 45counts per second. Determine its half life.(Solved)
A radioactive substance is found to have an activity of 360 counts per second. 5 minutes later, it was 45 counts per second. Determine its half life.
Date posted: April 12, 2018. Answers (1)
- State the characteristics of gamma radiation(Solved)
State the characteristics of gamma radiation
Date posted: April 12, 2018. Answers (1)
- State the characteristics of beta radiation(Solved)
State the characteristics of beta radiation
Date posted: April 12, 2018. Answers (1)
- State the characteristics of alpha radiation(Solved)
State the characteristics of alpha radiation
Date posted: April 12, 2018. Answers (1)
- What are the applications of photoelectric effect?(Solved)
What are the applications of photoelectric effect?
Date posted: April 12, 2018. Answers (1)
- The threshold wavelength of a photoemissive surface is 0.45µm. calculate:
a. The threshold frequency of the surface.
b. The workfunction of the surface in eV.
c. The minimum...(Solved)
The threshold wavelength of a photoemissive surface is 0.45µm. calculate:
a. The threshold frequency of the surface.
b. The workfunction of the surface in eV.
c. The minimum speed with which a photoelectron is emitted if the frequency of the radiation is 7.5x1014Hz.
Date posted: April 12, 2018. Answers (1)
- Light of frequency 4.3x1014Hz is irradiated on a surface of metal whose workfunction is 2.6eV. Explain
whether photoelectric emission will occur or not(Solved)
Light of frequency 4.3x1014Hz is irradiated on a surface of metal whose workfunction is 2.6eV. Explain
whether photoelectric emission will occur or not
Date posted: April 12, 2018. Answers (1)
- Calculate the energy of a photon of light of frequency 5.0x1014Hz in (a) joules (b) electron-volt.(Solved)
Calculate the energy of a photon of light of frequency 5.0x1014Hz in (a) joules (b) electron-volt.
Date posted: April 12, 2018. Answers (1)
- State any differences between x-rays and cathode rays.(Solved)
State any differences between x-rays and cathode rays.
Date posted: April 12, 2018. Answers (1)
- An x-ray tube operates at 20kV. What is the shortest wavelength in its x-ray beam?
(Solved)
An x-ray tube operates at 20kV. What is the shortest wavelength in its x-ray beam?
Date posted: April 12, 2018. Answers (1)
- An x-ray tube operates at 10kV and a current of 15mA. Calculate the number of electrons hitting the target per second.(Solved)
An x-ray tube operates at 10kV and a current of 15mA. Calculate the number of electrons hitting the target per second.
Date posted: April 12, 2018. Answers (1)
- Explain how you can increase:
a) Quality of x-rays.
b) Intensity of the x-rays.
(Solved)
Explain how you can increase:
a) Quality of x-rays.
b) Intensity of the x-rays.
Date posted: April 12, 2018. Answers (1)