In a Young's double-slit experiment, both the wavelength and the slit separation are increased by 25%. What happens to the distance between two adjacent bright fringes?
a. It decreases by 50%.
b. It increases by 50%.
c. The distance increases by 25% or more.
d. The distance stays the same.
D
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A helium nucleus is accelerated from rest through a potential difference V to a kinetic energy of 3.2 
What is V?
A. 1.0 MV B. 2.0 MV C. 1.6 MV D. 3.2 MV E. 0.51 MV
In the context of black holes, if an object collapses to zero radius, its density and gravity _____
A) remain constant B) increase C) become infinite D) decrease
Massive-star supernovae and white-dwarf supernovae work equally well as standard candles for measuring cosmic distances
Indicate whether the statement is true or false
Who suggested that material particles (protons, etc.) have wave properties too?
A) Bohr B) Einstein C) Planck D) Schrodinger E) de Broglie