B) mechanical motion.
C) heat and light energy.
D) electrical and heat energy.
As per the question the crumpled paper was burnt .
When the paper was burnt,it produces light.One also feels the sensation of heat.
The electrical energy is due to the flow of electrons. Here no electronic motion takes place.Hence no electrical energy will be produced.
Mechanical energy is the sum total of kinetic and potential energy.The kinetic energy is the energy gained due to the motion of the body and potential energy is the energy gained due to the position or configuration of the body.
Hence from above,we can get that the correct answer to the question is-C] Heat and light energy.
Answer:
A.) 273 K
Explanation:
Standard temperature, often referred to as standard room temperature, is defined as 0 degrees Celsius (0°C). To convert this temperature to Kelvin (K), you can use the following formula:
K = °C + 273.15
So, to find the temperature in Kelvin corresponding to 0 degrees Celsius:
K = 0°C + 273.15 = 273.15 K
Therefore, the temperature corresponding to standard temperature as 0 degrees Celsius is:
a. 273 K
Answer: B)
A hollow double concave lens acts as a diverging lens. When it is filled with a medium of higher refractive index than the surrounding, its diverging power increases.
So if the lens is:
A) Filled with air (n=1) and immersed in water (n=1.33) - Incorrect, air has lower refractive index than water
B) Filled with water (n=1.33) and immersed in CS2 (n=1.6) - Correct, water has lower refractive index than CS2
C) Filled with air (n=1) and immersed in CS2 (n=1.6) - Incorrect, air has lower refractive index than CS2
D) Filled with CS2 (n=1.6) and immersed in water (n=1.33) - Incorrect, CS2 has higher refractive index than water
Therefore, the lens will act as a diverging lens when filled with water and immersed in CS2, which is option B.
The key is that the material inside the lens must have a lower refractive index than the surrounding medium to increase the diverging power of the concave lens.
Explanation: