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Which of the following is NOT the unit of energy

• MeV

• J

• eV

• V

Which of the following is TRUE about photon

• Particle with a negative charge

• Quantum of electromagnetic wave

• Particle with a positive charge

• electron produced when light is incident on a metal surface

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

All these are the assumptions made by Planck EXCEPT

• EM radiation is in discrete packets of energy

• Energy of the EM radiation is continuously

• Energy of EM radiation is quantised

• The energy size of the radiation depends on its frequency

The quantum of the energy E for radiation is

• inversely proportional to its wavelength

• proportional to its wavelength

• inversely proportional to its frequency

• proportional to its intensity

Tags

NGSS.HS-PS4-1

The following statement are correct about Electron Microscope EXCEPT

• very short wavelength

• high resolving power

• there are 3 types of them

• controlled by electrostatic or magnetic lenses

Choose the irrelated answer

• Atomic number is the number of protons in a nucleus

• Mass number is the number of nucleons in a nucleus

• Neutron number the number of neutrons in a nucleus

• Electron number is the number of electrons in a nucleus

Which of the statement is CORRECT about nucleus stability

• its stability depends only on the forces exist inside it

• only nuclear forces exist inside the nucleus

• repulsive forces acted between proton and neutron

• electrostatics forces bind all nucleons

Choose the INCORRECT answer about binding energy per nucleon

• is a measure of the nucleus stability

• heavy nuclei contain an equal number of protons and neutrons

• heavy nuclei contain an equal number of protons and neutrons

• no of protons increase, the coulomb force increases

Choose the correct answer

• exothermic in which the energy absorbeb

• endoergic in which the energy released

• exoergic in which the energy absorbeb

• exothermic in which the energy released

The nucleus of an atom is made up of

• protons and neutrons

• protons and electrons

• protons, electrons dan neutrons

• electrons dan neutrons