ساينس ٢ع

Light waves are .... waves

• Mechanical transverse

• Electromagnetic transverse

• Mechanical longitudinal

The quantum of energy of green light is .... the quantum of energy of yellow light

• Greater than

• Equal to

• Half

• Less than

All of the following are from the characteristics of the red colours in spectrum colours except

• It has the lowest frequency

• It's photon has the highest deviation

• It has the longest wavelenth

Energy of the photon equals

• Planck's constant + frequency

• Planck's constant ÷ frequency

• Planck's constant - frequency

• Planck's constant × frequency

....... scientist proved that the energy of light waves is composed of photons

• Isaac newton

• Kepler

• Max planck

Sound of frequency 200Hz is ...... than sound of frequency 100 Hz

• Sharper

• Stronger

• Weaker

When the distance between the source of light and the surface as a wall decreases the light intensity on the surface

• Decrease

• Increase

• Double