Question 4696:

A bat emits a sound wave at a speed of 1650.00m/s and receives the echo 0.15s later. Calculate the distance of the bat from the reflector

A. 8.75m
B. 16 .60m
C. 87 .75m
D. 123.75m
E. 330.00m

Question 4697:

Which of the following is/are characteristics of sound?
i. pitch
ii. Loudness
iii. Quality
iv. Noise

A. I only
B. Ii only
C. I & ii only
D. I, ii & iii only
E. I, ii, iii and iv

Question 4698:

An image which can be formed on a screen is said to be ____________

A. Virtual
B. Blurred
C. Inverted
D. Erect
E. Real

Question 4699:

A ray of light is incident at an angle of 30° on a glass prism of refractive index 1.5. Calculate the angle through which the ray is minimally deviated in the prism (the medium surrounding the prism is air)

A. 10.5°
B. 5.5°
C. 21.1˚
D. 38.9°
E. 40.5°.

Question 4700:

At which of the following distances from the lens should as Ii de be placed in a slide projector if the focal length of the projection lens?

A. Less than f
B. Greater than 2f
C. Greater than f but less than 2f
D. Equal to f
E. Equal to 2f