spq 1 mistakes

Question 1

why is it frequency and not intensity of light source that determines whether emission of photoelectrons will occur or not. explainm

Answer 1

emission of photoelectrons depends on energy of photons.
when intensity increases energy of photons remains the same but when frequency increases energy of photons also increases.hence that’s why.

Question 2

when focal length is negative the lens behaves like a?

Answer 2

concave lens

Question 3

as binding energy increases stability?

Answer 3

increases

Question 4

explain why binding energy for heavy nuclei is low

Answer 4

in heavier nuclei the Colombian repulsion increases considerably and affects the attractive nuclear force. thus nuclei become unstable

Question 5

highest frequency wave?

Answer 5

gamma ray

Question 6

highest wavelength wave

Answer 6

radiowaves

Question 7

depletion region will _______ when p-n junction is reverse bias

Answer 7

decrease

Question 8

depletion region will _______ when p-n junction is forward bias

Answer 8

increase

Question 9

condition for magnified virtual image?

Answer 9

focal length should be greater than the object distance