Momentum

Q.

The momentum of a photon is $3.3\times {10}^{-29}kg-m/sec$. Its frequency will be

1. $6\times {10}^{3}Hz$

2. $3\times {10}^{3}Hz$

3. $7.5\times {10}^{12}Hz$

4. $1.5\times {10}^{13}Hz$

Q. An electron and a photon have same wavelength. It p is the momentum of electron and E the energy of photon. The magnitude of p/ E in S.I. unit is

1. $3.0\times {10}^8$
2. $9.1\times {10}^{-31}$
3. $3.33\times {10}^{-9}$
4. $6.64\times {10}^{-34}$

Q. A projectile of mass $4M$ is fired at a speed of $100\text{m/s}$ at an angle of ${37}^{\circ }$ from the horizontal. At the highest point, the projectile breaks into two parts with mass $M$ and $3M$. Mass $M$ falls down immediately after the explosion and mass $3M$ lands at some horizontal distance from mass $M$. Choose the correct statement. (Take $g=10{\text{m/s}}^2$)

1. Time taken by $4M$ to reach the highest point and time taken by $3M$ to land on the ground from the highest point will be the same.
2. Time taken by $4M$ to reach the highest point and time taken by $3M$ to land on the ground from the highest point will be different.
3. Distance covered by $4M$ along the horizontal ground and distance covered by $3M$ along the horizontal ground will be the same.
4. None of the above

Q. A projectile of mass $4M$ is fired at a speed of $100\text{m/s}$ at an angle of ${37}^{\circ }$ from the horizontal. At the highest point, the projectile breaks into two parts with mass $M$ and $3M$. Mass $M$ falls down immediately after the explosion and mass $3M$ lands at some horizontal distance from mass $M$. Choose the correct statement. (Take $g=10{\text{m/s}}^2$)

1. Time taken by $4M$ to reach the highest point and time taken by $3M$ to land on the ground from the highest point will be the same.
2. Time taken by $4M$ to reach the highest point and time taken by $3M$ to land on the ground from the highest point will be different.
3. Distance covered by $4M$ along the horizontal ground and distance covered by $3M$ along the horizontal ground will be the same.
4. None of the above

Q. A particle of mass $M$ is moving in a horizontal circle of radius $R$ with uniform speed $V$. When it moves from one point to a diametrically opposite point, its

1. Kinetic energy changes by $\frac{M{V}^2}{4}$
2. momentum does not change.
3. Momentum changes by $2MV$.
4. Kinetic energy changes by $M{V}^2$