Out of speed,frequency and wavelength,name the parameters which remain same after reflectrion?

Find five letter of English alphabet which are symmetrical and do not look same after reflection Also write five which letters which are not symmetrical and do not look same after reflection .

A sitar wire is replaced by another wire of same length and material but of three times the earlier radius.If the tension in the wire remains the same,by what factor will the frequency change?

Electron and proton are moving with the same speed, which will have more wavelength?

A ray of light travelling in air have wavelength lambda ,frequency v,velocity u and intensity I.If this ray enters into water,then these parameters are lambda',v',u' and I' respectively.which of the following relation is correct?

Does the ratio of neutrons to protons in a nucleus increase, decrease or remain the same after the emission of alpha-particl es .