1) What will be the effect on the horizontal range of a projectile when its initial speed is doubled keeping its angle of projection same.2) Plot a graph between kinetic energy and potential energy for an elastic spring with displacement.ChemistryWhich out of electron, proton, alpha particle has the maximum de Broglie wavelength provided they all have the same velocity?

Range=v²sin2A/g

Now,

v is doubled and angle remain same

=(2V)²sin2A/g 

=4v²sin2a/g

so range will become double

Chemistry

1 AS wavelwngth=h/mv

so whose mass will be bigger so wavelength will be less

so less mass is of electron is less so wavelength will be more for electron

Range = u²sin 2θ / g 

If u is doubled, range becomes 4 times.

For graph, consult a book.

Chemistry - Wavelength = h/mv

thus, it''s inversely propertional to mass. Electron has least mass and thus maximum wavelength .

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