We can find the momentum of the rock by using De Broglie's relationship:
![p= \frac{h}{\lambda}](https://tex.z-dn.net/?f=p%3D%20%5Cfrac%7Bh%7D%7B%5Clambda%7D%20)
where
p is the momentum
h is the Planck constant
![\lambda](https://tex.z-dn.net/?f=%5Clambda)
is the De Broglie's wavelength
By using
![\lambda=3.32 \cdot 10^{-34} m](https://tex.z-dn.net/?f=%5Clambda%3D3.32%20%5Ccdot%2010%5E%7B-34%7D%20m)
, we find
![p= \frac{6.6 \cdot 10^{-34} Js}{3.32 \cdot 10^{-34} m}=1.99 kg m/s](https://tex.z-dn.net/?f=p%3D%20%5Cfrac%7B6.6%20%5Ccdot%2010%5E%7B-34%7D%20Js%7D%7B3.32%20%5Ccdot%2010%5E%7B-34%7D%20m%7D%3D1.99%20kg%20m%2Fs%20)
The momentum of the rock is
![p=mv](https://tex.z-dn.net/?f=p%3Dmv)
where
![m=50 g=0.05 kg](https://tex.z-dn.net/?f=m%3D50%20g%3D0.05%20kg)
is the mass and v is its velocity. Rearranging the equation, we find the speed of the rock:
If the temperature in the tank is decreased this would imply that the kinetic energy of molecule decreases because of the ideal gas law:
PV= nRT (Since Pressure is directly proportional to Temperature).
So the answer is B.The air pressure in the rigid tank decreases.
Hope this helps you.
Answer:
a) 1.57, 1.61
B 1.91x10^8m/s , 1.86 x 10^8m/s
Explanation:
Ok we know that refractive index is given as = sin i/ sin r
And i is the angle of incidence in the air and r is angle of refraction in the glass,
So we can sa y
for red light n = sin75/sin38.1 = 1.57
and for violet, n =sin75/sin36.7 = 1.61
So
(a) 1.57, 1.61
(b) we know that
Refractive index n = c/v,
where c is speed off light in air and v is speed of light in glass,
So , v = c/n
for red light v = c/1.57 = 1.91 x 10^8 m/s
and for violet light, v = c/1.61 =
1.86 x 10^8 m/s
The answer would be tectonic. hope this helps (:
Answer:
Place the convex lens on a 'V' stand. . ii) Light a candle and take it far away from the lens along the principal axis. iii) Adjust the screen on the other side of the lens to get a clear image on it. iv) Measure the distance between the 'V' stand and the screen which gives a rough idea of the focal length of the lens.