Intensity vs Photocurrent

Q.

On investigation of light from three different stars A, B and C, it was found that in the spectrum of A the intensity of red colour is maximum, in B the intensity of blue colour is maximum and in C the intensity of yellow colour is maximum. From these observations it can be concluded that

1. The temperature of A is maximum, B is minimum and C is intermediate

2. The temperature of A is maximum, C is minimum and B is intermediate

3. The temperature of B is maximum, A is minimum and C is intermediate

4. The temperature of C is maximum, B is minimum and A is intermediate

Q.

The energy (E) of a photon of light is related to its frequency (f) as E = hf. Here, h is Planck's constant. The value of Planck's constant is h = $6.62\times {10}^{-34}$ J-s in Sl units. Convert it into CGS system of units

Q. Q. The ends of a stretched wire of length L are fixed at x = 0 and x = L. In one experiment the displacement of the wire is y1=Asin(πxL)sinωt and energy is E1 and in other experiment its displacement is y2=Asin(2πxL)sin2ωt and energy is E2 .Then A E2=E1 B E2=2E1 C E2=4E1 D E2=16E1

Q. In the photoelectric effect (for a given target and a given frequency of the incident light), which of these quantities depend on the intensity of the incident light beam?

1. The maximum kinetic energy of the electrons
2. The stopping potential
3. The threshold frequency
4. The maximum photoelectric current

Q.

In photoelectric effect if the intensity of light is doubled then maximum kinetic energy of photoelectrons will

1. Double

2. Half

3. become four times

4. will have no change

Q. If the intensity of the radiation on a photocell be increased four times, then the number of photoelectrons and the energy of photoelectrons emitted respectively become

1. four times, doubled
2. doubled, remains unchanged
3. remains unchanged, doubled
4. four times, remains unchanged

Q.

the energy of a photon depends upon its frequency. find the dimensions of the coeff. of the frequency(plancks constant) by the method of dimensions?

Q. In a hydrogen atom, the electron makes $6.6\times {10}^{15}\text{revolutions per second}$ around the nucleus in an orbit of radius $0.5\times {10}^{-10}\text{m}$. It is equivalent to a current nearly

1. $1\text{A}$
2. $1.6\times {10}^{-19}\text{A}$
3. $1\mu \text{A}$
4. $1\text{mA}$

Q. Does a light having high intensity have more number of photons as compared to low intensity light?

Q. The electron with charge $(q=1.6\times {10}^{-19}\text{C})$ moves in an orbit of radius $5\times {10}^{-11}\text{m}$ with a speed of $2.2\times {10}^6{\text{ms}}^{-1}$, around an atom. The equivalent current is:

1. $1.12\text{A}$
2. $1.12\times {10}^{-3}\text{A}$
3. $1.12\times {10}^{-9}\text{A}$
4. $1.12\times {10}^{-6}\text{A}$