Answer:
The electromagnetic radiation with the shortest wavelength are gamma rays.
Explanation:
Photons are the particles that constitute light and its kwnow that lights propagates as electromagnetic waves.
The electromagnetic spectrum is the distribution of radiation due to the different frequencies at which it radiates and its different intensities, that radiation is formed by electromagnetic waves, which are transverse waves formed by an electric field and a magnetic field perpendicular to it.
The distribution of the radiation in the electromagnetic spectrum can also be given in wavelengths, but it is more frequent to work with it at frequencies, the highest being that of gamma rays, followed by X-rays, ultraviolet rays and the visible region , and those of lower frequencies, which correspond to infrared, microwave and radio waves.
The energy given for each wavelength can be found by means of the following equation.
(1)
but 

(2)
Where E is the energy, h is the planck's constant and
is the wavelength.
So, it can be see in equation 2 that when the wavelength increases the energy decreases (inversely proportional).
Hence, the electromagnetic radiation with the shortest wavelength are gamma rays.
Answer:B,C,D
Explanation:
Thermodynamic efficiency is given by

efficiency can be increased by Keeping
constant and increasing 
Keeping
constant and decreasing
by increasing 
by decreasing
ratio
Mirrors don't cause refraction.
A convex mirror could cause parallel rays to REFLECT away from each other.
Answer:
The kinetic energy of the car is 
Explanation:
Answer:
decibels (dB)
Explanation:
The sound intensity level is a quantity derived from the sound intensity.
The intensity of a wave is defined as the power of the source of the wave divided by the area through which the power of the wave is spread, mathematically:

where
P is the power of the source
is the surface area over which the wave spreads (assuming that the wave propagates in all directions, it corresponds to the surface area of a sphere of radius
, where r is the distance between the source of the wave and the observer)
For sound waves, the intensity is often expressed using another unit, called decibel (dB), defined as follows:

where
is the sound intensity level in decibels
I is the intensity of the sound wave
is the threshold intensity of a sound that a person can normally hear.