EmSAT EmSAT Physics 4

Question 1

What is the speed of light in a vacuum?

Accepted Answer

3 × 10⁸ m/s

Answer

3 × 10⁶ m/s

Answer

3 × 10¹⁰ m/s

Answer

3 × 10⁴ m/s

Question 2

What type of wave is sound?

Accepted Answer

Longitudinal wave

Answer

Transverse wave

Answer

Electromagnetic wave

Answer

Surface wave

Question 3

What happens to the frequency of a wave when its wavelength decreases (speed constant)?

Accepted Answer

Frequency increases

Answer

Frequency decreases

Answer

Frequency stays the same

Answer

Frequency doubles then halves

Question 4

What is the Doppler effect?

Accepted Answer

Change in observed frequency due to relative motion

Answer

Light bending around obstacles

Answer

Wave reflection from a surface

Answer

Wave energy decreasing with distance

Question 5

Which type of electromagnetic wave has the highest frequency?

Accepted Answer

Gamma rays

Answer

Radio waves

Answer

Visible light

Answer

X-rays

Question 6

What is the law of reflection?

Accepted Answer

The angle of incidence equals the angle of reflection

Answer

The angle of incidence equals the angle of refraction

Answer

Reflected waves change speed

Answer

Light bends toward the normal when entering a denser medium