Work is in units of Jules, so any comparison with time is incorrect. Answer D is the definition for velocity, which is incorrect. Answer C is the correct answer
        
             
        
        
        
<u>Answer</u>
46,200 J
The energy of given out when a substance is losing heat is given by:
H = mcΔθ
Where m is the mass of the substance, 
             c is the specific heat capacity of the substance and 
            Δθ is the temperature change. 
H = 0.50 × 22 4200
   = 46,200 Joules.
 
        
             
        
        
        
The temperature inside the copper rod varies linearly with the distance from the hot end of the rod. This means that we can find the temperature at 23 cm (let's call it 'point A') from the cool end by solving a linear proportion.
The temperature difference between the two ends of the rod is

and this corresponds to a length of 81 cm. Therefore, we can write:

from which we find

This is not the final answer actually; this is the temperature difference between the cool end and point A. So, the temperature at point A is
 
 
        
        
        
Answer:
 1.312 x 10⁻¹² J/nucleon
Explanation:
mass of ¹³⁶Ba = 135.905 amu
¹³⁶Ba contain 56 proton and 80 neutron 
mass of proton = 1.00728 amu
mass of neutron = 1.00867 amu
mass of ¹³⁶Ba = 56 x  1.00728 amu + 80 x 1.00867 amu
                       = 137.10128 amu
mass defect = 137.10128 - 135.905
                     = 1.19628 amu
mass defect = 1.19628 x 1.66 x 10⁻²⁷ Kg
                      = 1.9858 x 10⁻²⁷ Kg
speed of light = 3 x 10⁸ m/s
binding energy, 
E = mass defect x c²
E = 1.9858 x 10⁻²⁷ x (3 x 10⁸)²
E = 17.87 x 10⁻¹¹ J/atom
now,
binding energy per nucleon =
                                               = 0.1312 x 10⁻¹¹ J/nucleon
                                               = 1.312 x 10⁻¹² J/nucleon
 
        
             
        
        
        
Answer:

Explanation:
Given:
- wavelength of light in the air,  
- time taken to travel from the source to the photocell via air,  
- time taken to reach the photocell via air and glass slab,  
- thickness of the glass slab,  
<u>Now we have the relation for time:</u>

hence,

c= speed of light in air



For the case when glass slab is inserted between the path of light:
 (since light travel with the speed c only in the air)
 (since light travel with the speed c only in the air)
here: 
v = speed of light in the glass


Using Snell's law:


