Questions in atomic-structure

Select	Question
	If the velocity of hydrogen molecule is $5 \times {10^4}cm\,se{c^{ - 1}}$, then its de-Broglie wavelength is
	A $200$g golf ball is moving with a speed of $5$ m per hour. The associated wave length is $(h = 6.625 \times {10^{ - 34}}J{\rm{ - }}sec)$
	A cricket ball of $0.5\,kg$ is moving with a velocity of $100\,m/\sec $. The wavelength associated with its motion is
	Dual nature of particles was proposed by
	Calculate de-Broglie wavelength of an electron travelling at $1%$ of the speed of light
	Which is the correct relationship between wavelength and momentum of particles
	The de-Broglie equation applies